US553044A - Pipette - Google Patents

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US553044A
US553044A US553044DA US553044A US 553044 A US553044 A US 553044A US 553044D A US553044D A US 553044DA US 553044 A US553044 A US 553044A
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tube
measuring
valve
open
pump connection
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01LCHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
    • B01L3/00Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
    • B01L3/02Burettes; Pipettes
    • B01L3/021Pipettes, i.e. with only one conduit for withdrawing and redistributing liquids

Definitions

  • My invention relates to measuring devices which are especially adapted for rapidly and accurately measuring uniform quantities of liquids.
  • an automatic pipette comprising a measuring-tube having one of its open ends arranged in communication With an air-tight overflow-chamber having a pump connection by means of which suction is exerted through said overflow-chamber to iill the measuring-tube to overflowing and thereafter hold the measured liquid until the saine is discharged by the reversal of the pump action.
  • the main object of my invention is to provide a device of this kind having means separate from the pump connection, whereby to hold or release the measured liquids.
  • Figure l illustrates a pipette embodying my invention in its simplest form.
  • Fig. 2 shows a modified arrangement
  • Fig. 3 a different form of stopper-valve applicable to the construction shown in Fig. l.
  • A represents a measuring tube having openings a and a", and of any desired capacity.
  • This overflow-vessel is provided With a pump connection?) and with an open neck b'.
  • this neck b' is tightly closed by a stopper C in the ⁇ form of a flexible disk of rubber or other suitable material, and the open end a of the measuring-tube is extended into such proximity to the disk as to permit the latter to be depressed into contact with it so as to seal the opening a..
  • the pump connection b may be provided With a iieXible bulb D, in which case the device is operated by rst compressing this, then inserting the opening d' of the measuring-tube in the liquid, releasing the bulb to fill the tube, and as soon as the latter overiiows at a depressing the stoppervalve C to close the tube, and thus securely hold the liquid until it is conveyed to the delivery-point, when the valve C is raised and the liquid released; or the pump connection may be extended, as indicated in dotted lines, and the mouth of the operator applied thereto as al means of exhausting the air from the overflow-chamber, the suction being stopped as soon as the overflow appears and the stopper-valve simultaneously closed.
  • the disk C is preferably made of moderately-heavy rubber, sufficiently stii to prevent its being drawn to its seat upon the measuring-tube by the suction exerted through the pump connection, the pressure of the operators linger being preferably utilized to effect this closing of the tube andthe elasticity of the disk serving to open it when released.
  • the pump connection b is provided With a check-valve b2 and the open neckV b' of the overflow-vessel is closed by the operator While the liquid is being drawn into the tube by suction at l). Then the liquid overflows the tube at a the suction is stopped, and the check-valve drops to its seat, and the measured liquid is held until released by uncovering the opening b'.
  • a hollow stopper C' is employed in connection with a flexible valve c, and a button c for seating the same upon the end of the measuring-tube.
  • a measuring device for liquids comprising a measuring tube open at two points, an overilow chamber arranged in communication with one of said openings, a pump connection to said overiiow chamber, and means separate from said pump connection adapted to operate upon said overflow opening of the measuring tube to hold or discharge the liquid therein, substantially as set forth.
  • a measuring device for liquids comprising a measuring tube open at two points, an overiiovv chamber arranged in communica- IOO neetion7 and-a stopper valve fitted to said neck and adapted to open 0r Close said communicating Opening of the measuring tube.

Description

(No Model.)
' Y P. M. SHARPLES.
* PIPBTTE. ,N0553,044. 'PatentedJanl 14, 1896.
VVitnesses:
UNITED STATES PATENT EEIcEe PHILIP M. SHARPLES, OF "WEST CHESTER, PENNSYLVANIA.
PlPETTE.
SPECIFICATION forming part of Letters Patent No. 553,044, dated January 14, 1896. l Application filed December 4,. 1894. Renewed December 13, 1895. Serial No. 572,045. (No model.)
To @ZZ whom it 11i-ay concern:
Be it known that I, PHILIP M. SIIAEPLES, a citizen of the United States, residing at West Chester, county of Chester, State of Pennsylvania, have invented certain Improvements in Pipettes, ot' which the following is a specilication.
My invention relates to measuring devices which are especially adapted for rapidly and accurately measuring uniform quantities of liquids.
In a pending application of David T. Sharples, Serial No. 457,086, filed October 3, lSJS, is shown and described an automatic pipette comprising a measuring-tube having one of its open ends arranged in communication With an air-tight overflow-chamber having a pump connection by means of which suction is exerted through said overflow-chamber to iill the measuring-tube to overflowing and thereafter hold the measured liquid until the saine is discharged by the reversal of the pump action.- The main object of my invention is to provide a device of this kind having means separate from the pump connection, whereby to hold or release the measured liquids.
The invention is described in connection with the accompanying drawings and is specitically pointed out in the claims.
Figure l illustrates a pipette embodying my invention in its simplest form. Fig. 2 shows a modified arrangement, and Fig. 3 a different form of stopper-valve applicable to the construction shown in Fig. l.
A represents a measuring tube having openings a and a", and of any desired capacity.
B is an overi'loivchamber inclosing the open end a of the measuring-tube. This overflow-vessel is provided With a pump connection?) and with an open neck b'. In Eig. l this neck b' is tightly closed by a stopper C in the `form of a flexible disk of rubber or other suitable material, and the open end a of the measuring-tube is extended into such proximity to the disk as to permit the latter to be depressed into contact with it so as to seal the opening a.. The pump connection b may be provided With a iieXible bulb D, in which case the device is operated by rst compressing this, then inserting the opening d' of the measuring-tube in the liquid, releasing the bulb to fill the tube, and as soon as the latter overiiows at a depressing the stoppervalve C to close the tube, and thus securely hold the liquid until it is conveyed to the delivery-point, when the valve C is raised and the liquid released; or the pump connection may be extended, as indicated in dotted lines, and the mouth of the operator applied thereto as al means of exhausting the air from the overflow-chamber, the suction being stopped as soon as the overflow appears and the stopper-valve simultaneously closed. The disk C is preferably made of moderately-heavy rubber, sufficiently stii to prevent its being drawn to its seat upon the measuring-tube by the suction exerted through the pump connection, the pressure of the operators linger being preferably utilized to effect this closing of the tube andthe elasticity of the disk serving to open it when released.
In the modified construction shown in Eig. l the pump connection b is provided With a check-valve b2 and the open neckV b' of the overflow-vessel is closed by the operator While the liquid is being drawn into the tube by suction at l). Then the liquid overflows the tube at a the suction is stopped, and the check-valve drops to its seat, and the measured liquid is held until released by uncovering the opening b'.
In the modied form of stopper-valve shown in Fig. 3 a hollow stopper C' is employed in connection with a flexible valve c, and a button c for seating the same upon the end of the measuring-tube.
Having thus fully described my invention in connection with several of many modications which may be devised, I do not desire to limit myself to the specific construction shown, but
That I claim isl. A measuring device for liquids comprising a measuring tube open at two points, an overilow chamber arranged in communication with one of said openings, a pump connection to said overiiow chamber, and means separate from said pump connection adapted to operate upon said overflow opening of the measuring tube to hold or discharge the liquid therein, substantially as set forth.
2. A measuring device for liquids comprising a measuring tube open at two points, an overiiovv chamber arranged in communica- IOO neetion7 and-a stopper valve fitted to said neck and adapted to open 0r Close said communicating Opening of the measuring tube.
substantially as set forth. r 5
In testimony whereof I aiix my signature in presence of two Witnesses.
PHILIP M. SHARPLES. lVtnesses ADDAv E. WORRALL, XVM. S. WINDLE.
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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE746230C (en) * 1939-06-04 1944-06-05 Elisabeth Buesing Geb Brems Device for serial measuring and filling of certain quantities of liquid
US2737812A (en) * 1952-06-23 1956-03-13 Paul O K Haak Pipette
US2930238A (en) * 1958-04-28 1960-03-29 Smith Kline French Lab Pipette
US2932974A (en) * 1955-08-05 1960-04-19 Vogel Paul Instruments for the manipulation of dangerous liquids
US2994349A (en) * 1957-10-29 1961-08-01 Peter T Demos Pipette control device
US3444742A (en) * 1965-12-06 1969-05-20 Univ Of Kentucky Research Foun Multiple-unit pipetting assembly and pipette for use therein
US3696971A (en) * 1970-09-24 1972-10-10 Electro Nucleonics Mechanism for simultaneously metering and dispensing liquids
US4054061A (en) * 1976-01-14 1977-10-18 Alfredo Valt Graduated pipette equipped with a lateral suctions squirt
FR2411031A1 (en) * 1977-12-07 1979-07-06 Hoffmann La Roche PIPETTE SHUTTER
US20080264187A1 (en) * 2004-07-16 2008-10-30 Stemcell Technologies Inc. Automated pipette machine
WO2016010687A1 (en) 2014-07-16 2016-01-21 Carestream Health, Inc. Sampling device

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE746230C (en) * 1939-06-04 1944-06-05 Elisabeth Buesing Geb Brems Device for serial measuring and filling of certain quantities of liquid
US2737812A (en) * 1952-06-23 1956-03-13 Paul O K Haak Pipette
US2932974A (en) * 1955-08-05 1960-04-19 Vogel Paul Instruments for the manipulation of dangerous liquids
US2994349A (en) * 1957-10-29 1961-08-01 Peter T Demos Pipette control device
US2930238A (en) * 1958-04-28 1960-03-29 Smith Kline French Lab Pipette
US3444742A (en) * 1965-12-06 1969-05-20 Univ Of Kentucky Research Foun Multiple-unit pipetting assembly and pipette for use therein
US3696971A (en) * 1970-09-24 1972-10-10 Electro Nucleonics Mechanism for simultaneously metering and dispensing liquids
US4054061A (en) * 1976-01-14 1977-10-18 Alfredo Valt Graduated pipette equipped with a lateral suctions squirt
FR2411031A1 (en) * 1977-12-07 1979-07-06 Hoffmann La Roche PIPETTE SHUTTER
US20080264187A1 (en) * 2004-07-16 2008-10-30 Stemcell Technologies Inc. Automated pipette machine
US20090007703A1 (en) * 2004-07-16 2009-01-08 Stemcell Technologies Inc. Automated pipette machine
US7814805B2 (en) 2004-07-16 2010-10-19 Stemcell Technologies Inc. Automated pipette machine
US7819029B2 (en) * 2004-07-16 2010-10-26 Stemcell Technologies Inc. Automated pipette machine
WO2016010687A1 (en) 2014-07-16 2016-01-21 Carestream Health, Inc. Sampling device

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