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Publication numberUS3850580 A
Publication typeGrant
Publication dateNov 26, 1974
Filing dateMar 15, 1973
Priority dateMar 15, 1973
Publication numberUS 3850580 A, US 3850580A, US-A-3850580, US3850580 A, US3850580A
InventorsD Moore, W Walsh
Original AssigneeSybron Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Laboratory mixer
US 3850580 A
Abstract
A mixer for mixing fluent material contained in test tubes, flasks and like vessels is provided with a resilient surface for receiving the vessel. The surface is then driven eccentrically to agitate the vessel for producing a vortex mixing action in the vessel. Since the surface is resilient, the amount of agitation imparted to the vessel is dependent on the force with which the vessel is pressed against and into the resilient surface.
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Description  (OCR text may contain errors)

1: States Patent [191 Moore et a1.

1 51 Nov. 26, 1974 LABORATORY MIXER [75] Inventors: Darrlle DeForest Moore; William Joseph Walsh, both of Dubuque,

Iowa

[73] Assignee: Sybron Corporation, Rochester,

[22] Filed: Mar. 15, 1973 [2]] Appl. No.: 341,462

{52] US. Cl 23/259, 233/23 R, 233/24, 259/1 R, 259/DIG. 42 [51] Int. Cl B011 9/00, BOlf 11/00 [58] Field of Search 23/259; 259/1 R, DIG. 42;.

[56] References Cited UNITED STATES PATENTS 3.061.280 10/1962 Kraft et a1 23/259 3,159,384 12/1964 Davis ..259/1R Primary Examiner-Barry S. Richman Assistant Examiner-Dale Lovercheck Attorney, Agent, or Firm-Theodore B. Roessel; Roger Aceto [57] ABSTRACT A mixer for mixing fluent material contained in test tubes, flasks and like vessels is provided with a resilient surface for receiving the vessel. The surface is then driven eccentrically to agitate the vessel for producing a vortex mixing action in the vessel. Since the surface is resilient, the amount of agitation imparted to the vessel is dependent on the force with which the vessel is pressed against and into the resilient surface.

5 Claims, 2 Drawing Figures LABORATORY MIXER BACKGROUND OF THE INVENTION The present invention relates generally to apparatus for mixing fluent material and more specifically to mixers of the type in which a vessel is agitated eccentrically to produce a vortex mixing action. In particular, the

mixer of the present invention is intended for use in laboratories and the like to agitate such vessels as test tubes, flasks and similar laboratory vessels.

Such mixers are known in the art, a typical apparatus being illustrated in U.S. Pat. No. 3,061,280. In such mixers, the vessel, usually a test tube, is held in or against a cup-shaped member which is eccentrically driven to agitate the vessel. In some mixers, the amount or degree of agitation can be manually adjusted by changing the throw or rotational speed of the eccentric drive.

With mixers of this type it is not possible to agitate.

several test tubes at one time or a relatively large vessels such as a flask or a beaker and manual adjustment of the agitation can be difficult when the vessel is being manually held against the eccentrically driven member.

SUMMARY OF THE INVENTION In the present preferred form of the invention, the mixer is provided with a relatively large resilient top surface supported on three upright wire rod elements which fix the surface against concentric rotation while permitting movement of the surface in a horizontal plane. A dynamic mounting connected beneath the surface drives the resilient top eccentrically, so that any vessel placed on the surface will be agitated. The surface is large enough to accommodate several test tubes or a flask manually held against the surface. No manual means are provided for changing the throw of the eccentric drive. Instead, the degree of agitation transmitted to a vessel depends upon the force with whichthe vessel is held against the resilient surface.

OBJECTS OF THE INVENTION One object of the present invention is to provide a mixer for laboratory use which is capable of simultaneously accommodating a plurality of test tubes or like vessels.

Another object is to provide a vortex laboratory mixer having a relatively large eccentrically driven surface against which vessels, such as Erlenmeyer flasks and the like, can be manually held for vortex mixing the fluent contents of the vessel.

A further object is to provide a vortex mixer for laboratory use wherein the eccentrically driven surface against which the vessels are held for mixing is made of a resilient material so that the degree of agitation imparted to the vessel depends upon the force with which the vessel is pressed against and into the resilient surface.

These and other objects, advantages and characterizing features of the present invention will become more apparent upon consideration of the following detailed description thereof when taken in connection with the accompaning drawings depicting the same.

DESCRIPTION OF THE DRAWINGS FIG. I is a perspective view of the mixer of the present invention; and

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, FIG. 1 shows a mixer of the present invention generally indicated at 10. The mixer includes a base housing 12, an oscillating plate 14 and a pad member 16 adhesively attached to the plate. The top of the housing also has a push on-push off switch 18 for starting and stopping the oscillation of base plate is an electric-drive motor 32. The motor is eccentrically connected to oscillating plate 14 by a eccentric coupling member 36. In this respect, motor 32 has its drive shaft 34 fixed to member 36. Also fixed to member 36 in an opening 38 eccentrically positioned with respect to shaft 34 is a second drive shaft 40. Any

suitable means such as set screws 42 can be used to fix shafts 34 and 40 to member 36.

Second shaft 40 extends upwardly into a bearing 44 which is fixed in a central opening 46 through oscillating plate 14. With this arrangement rotation of shaft 34 and eccentric member 36 will rotate shaft 40 ina concentric circle about shaft 34. This drives oscillating plate 14 but because the plate is fixed by rods 22 against concentric rotation, plate 14 will simply oscillate to shake or agitate any vessel placed on the surface of pad member 16.

Formed integral with eccentric 36 on the far side of shaft 34 from shaft 40 is a counterbalance portion 43. This counterbalance provides dynamic stability as the eccentric is being rotated to minimize vibration and "walking" of the apparatus.

In operation, switch 18 is pushed to start motor 32,

the motor receiving electrical power through a line cord, a portion of which is shown at 48. The operation It is preferred that pad 16 be made of a highly resilient material such as a closed cell foamed neoprene. If such a highly resilient material is used for pad 16, the amount of agitation transferred to the vessel can be controlled by the force with which the vessel is pressed against and into the resilient pad. In this respect, the greater the force with which the vessels is pressed into resilient pad 16, the more friction between the vessel and pad and the more compacted and firm will be the area indicated at 50 beneath and around the vessel.

This permits a greater degree of agitation when the vessel is pressed hard against resilient pad 16 and a lesser degree of agitation when the vessel is only lightly pressed against the surface. Thus, in the present invention, the degree of agitation can be changed quickly and easily simply by changing the pressure with which vessel 52 is manually held against and pressed into resilient pad 16.

In order to protect bearing 44 and prevent resilient pad 16 from being pressed into opening 46 when a vessel is held against the pad, a cover 54 is adhesively attached over the opening.

Having thus described the invention in detail, it should be appreciated that the present invention accomplishes its intended objects in providing a mixer of the vortex mixing type which is suitable laboratory use. The relatively large oscillating surface provided by pad 16 can accommodate a variety of laboratory vessels such as test tubes and flasks. Furthermore, since the vessels are all manually held on pad 16, it would be possible for the operator to hold a plurality of test tubes in his hand and simultaneously press them all against pad 16. A further accomplishment of the present invention is that there is no need for means to mechanically adjust the amount of agitation since the degree of agitation can be changed simply by changing the force with which the vessel is pressed against and into resilient pad 16.

Having thus described the invention, what is claimed as new is:

l. in a laboratory mixer having a base, a plate supported above the base and an eccentric drive means mounted on the base and operatively connected to the plate to shake the plate, the improvement comprising a substantially flat resilient foamed rubber pad fixed to the upper surface of said plate to receive thereon a vessel to be agitated, the degree of agitation imparted to said vessel being determined solely by the force with which said vessel is pressed against said pad.

2. A laboratory mixer as in claim 1 including at least three spring wire rods upstanding from said base, said plate being supported on the upper ends of said rods, said rods preventing rotation of said plate while permiting said plate to vibrate responsive to operation of said eccentric drive means.

3. A laboratory mixer comprising:

a. a base;

b. at least three spring wire rods upstanding from said base;

c. a plate supported on the upstanding ends of said rods;

d. motor means mounted on said base;

e. eccentric means operatively connected to said plate to shake said plate when driven by said motor means; and

f. vessel contact means including a substantially flat pad of resilient material fixed to said plate and adapted to transfer the eccentric motion of said plate to a vessel manually pressed against said pad, the degree of agitation imparted to said vessel by said resilient pad being dependent upon the force with which said vessel is made to frictionally engage and compress said pad.

4. A laboratory mixer as in claim 3 substantially flat wherein said resilient pad is made of closed cell foamed neoprene.

5. A laboratory mixer as in claim 3 including a housing enclosing said motor and a major portion of said spring wire rods, there being openings in the top of said housing to permit passage of the upper ends of said rods so that said plate is supported above the top of said housing.

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US3061280 *Apr 6, 1959Oct 30, 1962Kraft Scient CorpApparatus for mixing fluent material
US3159384 *Jul 2, 1962Dec 1, 1964Bio Science LaborAgitator for laboratory tubes and flasks
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US3948354 *Sep 18, 1974Apr 6, 1976Hydrotile Machinery CompanyLubricator for concrete pipe vibrators
US4004883 *Jul 11, 1975Jan 25, 1977G. D. Searle & Co.Sensing, leveling and mixing apparatus
US4555183 *Feb 6, 1984Nov 26, 1985Reese Scientific CorporationHigh speed test tube agitator apparatus
US4747693 *Nov 20, 1986May 31, 1988Murray KahlLaboratory mixer
US4895453 *Aug 24, 1988Jan 23, 1990E. I. Du Pont De Nemours And CompanyVortex mixer drive
US4935274 *Aug 26, 1988Jun 19, 1990E. I. Du Pont De Nemours And CompanyLid structure
US5009942 *Aug 26, 1988Apr 23, 1991E. I. Du Pont De Nemours And CompanyVortexing liquid container
US5104231 *Jul 26, 1991Apr 14, 1992E. I. Du Pont De Nemours And CompanyVortex mixer drive
US5795784 *Sep 19, 1996Aug 18, 1998Abbott LaboratoriesMethod of performing a process for determining an item of interest in a sample
US5856194 *Sep 19, 1996Jan 5, 1999Abbott LaboratoriesMethod for determination of item of interest in a sample
US6059446 *May 19, 1998May 9, 2000Dschida; William J. A.Apparatus for mixing the contents of microcentrifuge tubes
US6562298Apr 23, 1999May 13, 2003Abbott LaboratoriesStructure for determination of item of interest in a sample
US7575363 *Dec 5, 2006Aug 18, 2009Eppendorf AgApparatus for shaking sample containers
US7654729 *Mar 24, 2005Feb 2, 2010Giovanni PassoniTest-tube agitation device, comprising means for the optical detection of a test-tube
US7708946 *Nov 12, 2008May 4, 2010Michael ShermanDevice for protein detecting tests
US8550696 *Mar 6, 2007Oct 8, 2013Eppendorf AgLaboratory mixer and vortexer
US9084974 *Sep 24, 2010Jul 21, 2015bioMeriéux, S.A.Process and device for mixing a heterogeneous solution into a homogeneous solution
US20050190641 *Feb 28, 2004Sep 1, 2005Countz John W.Method and system for mixing fingernail polish
US20070125186 *Dec 5, 2006Jun 7, 2007Eppendorf AgApparatus for shaking sample containers
US20070211566 *Mar 6, 2007Sep 13, 2007Eppendorf AgApparatus for mixing laboratory vessel contents with a sensor
US20070212265 *Mar 6, 2007Sep 13, 2007Eppendorf AgApparatus for mixing laboratory vessel contents
US20080298162 *Mar 24, 2005Dec 4, 2008Giovanni PassoniTest-Tube Agitation Device, Comprising Means for the Optical Detection of a Test-Tube
US20120182829 *Sep 24, 2010Jul 19, 2012Biomerieux SaProcess and Device for Mixing a Heterogeneous Solution into a Homogeneous Solution
USD737992 *Jun 4, 2014Sep 1, 2015SEIRATHERM GmbHMedical equipment for mixing medical liquids
DE3014551A1 *Apr 16, 1980Oct 22, 1981Janke & Kunkel & Co Kg Ika WerSchuettelvorrichtung fuer fluessigkeiten o.dgl.
DE3220879A1 *Jun 3, 1982Dec 8, 1983Liebisch GebTest tube shaker for mixing and whirling up analysis fluids
EP1832336A1 *Mar 5, 2007Sep 12, 2007Eppendorf AgDevice for mixing, in particular the contents of laboratory vessels
WO2000001412A1 *Apr 16, 1999Jan 13, 2000DigibioMethod for activating an inactive solution
Classifications
U.S. Classification422/500, 366/278, 494/16, 366/277
International ClassificationB01F11/00
Cooperative ClassificationB01F11/0014
European ClassificationB01F11/00C4
Legal Events
DateCodeEventDescription
Jan 25, 1988ASAssignment
Owner name: MANUFACTURERS HANOVER TRUST COMPANY
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST. ASSIGNS THE ENTIRE INTEREST;ASSIGNORS:SAC/THERMOLYNE, INC.;SAC/BARNSTEAD, INC.;SAC/THERMO-BARN, INC.;AND OTHERS;REEL/FRAME:004834/0513
Effective date: 19871020
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SAC/THERMOLYNE, INC.;SAC/BARNSTEAD, INC.;SAC/THERMO-BARN, INC. AND OTHERS;REEL/FRAME:4834/513
Owner name: MANUFACTURERS HANOVER TRUST COMPANY,STATELESS
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:SAC/THERMOLYNE, INC.;SAC/BARNSTEAD, INC.;SAC/THERMO-BARN, INC.;AND OTHERS;REEL/FRAME:004834/0513
Sep 15, 1986ASAssignment
Owner name: THERMOLYNE HOLDINGS, INC., A CORP OF DE.
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:SYBRON CORPORATION;REEL/FRAME:004610/0379
Effective date: 19860731
Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:SYBRON CORPORATION;REEL/FRAME:004610/0379
Owner name: THERMOLYNE HOLDINGS, INC., A CORP OF DE., STATELE
Sep 15, 1986AS02Assignment of assignor's interest
Owner name: SYBRON CORPORATION
Effective date: 19860731
Owner name: THERMOLYNE HOLDINGS, INC., A CORP OF DE.