Source: http://www.google.com/patents/US5547280?dq=7350717
Timestamp: 2014-07-29 21:54:12
Document Index: 629115961

Matched Legal Cases: ['art 3', 'art 4', 'art 3', 'art 4', 'art 3', 'art 4', 'art 4']

Patent US5547280 - Magnetic stirrer with a sealed glass housing - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA magnetic stirrer (1) has a two-part housing (2), wherein the lower part (3) contains a drive motor (5) and its controlling, while the upper part (4) forms the mounting surface for a stirring container that holds the stirring magnet, and wherein the separating surface of the two parts (3) and (4) runs...http://www.google.com/patents/US5547280?utm_source=gb-gplus-sharePatent US5547280 - Magnetic stirrer with a sealed glass housingAdvanced Patent SearchPublication numberUS5547280 APublication typeGrantApplication numberUS 08/394,971Publication dateAug 20, 1996Filing dateFeb 27, 1995Priority dateFeb 25, 1994Fee statusLapsedAlso published asDE4406217A1, DE4406217C2, EP0669160A1, EP0669160B1Publication number08394971, 394971, US 5547280 A, US 5547280A, US-A-5547280, US5547280 A, US5547280AInventorsAlfred Wanninger, deceased, Peter Wanninger heir byOriginal AssigneeJanke & Kunkel Gmbh & Co. Kg Ika-LabortechnikExport CitationBiBTeX, EndNote, RefManPatent Citations (12), Referenced by (10), Classifications (4), Legal Events (8) External Links: USPTO, USPTO Assignment, EspacenetMagnetic stirrer with a sealed glass housingUS 5547280 AAbstract A magnetic stirrer (1) has a two-part housing (2), wherein the lower part (3) contains a drive motor (5) and its controlling, while the upper part (4) forms the mounting surface for a stirring container that holds the stirring magnet, and wherein the separating surface of the two parts (3) and (4) runs approximately horizontal when in the working position. The upper part (4) of this housing (2) is made of glass and the edge (8) of this upper part (4), when in its working position, is tightly pressed against an opposing surface (9) of the lower part (3), and is possibly even bonded thereto. The edge (8) can have a widening (10) that engages into a corresponding undercut (11) of the lower part (3). This provides a very simple and economical design for the magnetic stirrer (1), but one which is nevertheless also tightly sealed and impervious to aggressive vapors.
I claim: 1. A magnetic stirrer (1) comprising a housing (2) having a lower part (3) and an upper part (4) connectable with the lower part, a drive motor (5) with controlling means for controlling the drive motor, an electrical connection for the drive motor and a drive magnet (6), drivingly attached to the drive motor, located in the lower part (3) of the housing (2), the upper part (4) forming on its top side a mounting surface (7) for a stirring container that holds a stirring magnet, the upper part (4) being made of glass and having a cupped or bowl shape with a lower, free, circumferential edge (8) pressed against an opposing surface (9) of the lower part (3), the lower, free, circumferential edge (8) having a widening (10), and the opposing surface (9) forming a seat having an undercut (11) for receiving the widening (10) in a self-sealing manner.
FIELD OF THE INVENTION The invention pertains to a magnetic stirrer with a housing that has a lower part and an upper part connectable with it, wherein the drive motor with its controlling means and the electrical connection are placed in the lower part, and the upper part can be placed on top of the lower part and forms with its top side the mounting surface for a stirring container that holds the stirring magnet.
BACKGROUND OF THE INVENTION Magnetic stirrers of this type are already known in practice. Since as a rule they do not contain any heating, the upper part of the housing can at the same time be the mounting surface for the stirring container. As a rule, the housing upper part is made of plastic, so that in the case of an aggressive medium to be stirred, there exists the danger that this upper part can be damaged by overflowing ingredients or substances, or even by aggressive vapors that are released during stirring. If the container has been wetted on the outside with the aggressive medium that is to be stirred, the contact surface is exposed to this medium for a corresponding length of time, and as a result can, in some cases, become irreparably damaged.
SUMMARY OF THE INVENTION The object therefore exists of creating a magnetic stirrer of the type mentioned at the beginning, in which the mounting surface is largely impervious to aggressive media, liquids in particular but also including vapors, and in spite of that can be manufactured economically and allows for a simple and effective seal with respect to the lower part.
DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS A magnetic stirrer that is identified in its entirety by 1 has a housing 2, which is made up of two parts, namely a lower part 3 and an upper part 4. In the lower part 3 are placed a drive motor 5 with controlling means and the like and with the electrical connection as well. This drive motor 5 has magnets 6 by means of which a stirring magnet (not shown) can be placed into corresponding rotation in a stirring container. The upper part 4 is secured to the lower part 3, and the upper side 7 of this upper part 4 is the mounting surface for a stirring container that holds the stirring magnets and that is often made of glass.
In accordance with FIGS. 1 and 2, the shaft 13 of the control knob 14 is coupled with an adjustable potentiometer 18, the change of which brings about a corresponding change in the speed of the motor. If in this regard the control knob shaft 13 were to be turned too far, the potentiometer 18, which has only a limited permissible angle of rotation, could be damaged or torn from its mounting. The user is able to monitor this easily, however, since the upper part 4 is made of glass and can thus be transparent. However, in the embodiment described, an additional safeguard against such damage is provided by virtue of the fact that, for the control knob 14, there is provided in its path of rotation a limit stop 20 that limits this path of rotation to the maximum permissible angle of rotation of the potentiometer 18. This limit stop 20 can be seen as an interior projection in the control knob in FIGS. 4 and 5. It projects into a corresponding cutout 21 in the control knob bearing support 15, and limits the predetermined angle to approximately 270� in either direction. In FIG. 3 this cutout, which extends around the major portion of the circumference of the control knob bearing support 15, can be easily seen as a limit stop projection 22 that projects into this cutout.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS2350534 *Oct 5, 1942Jun 6, 1944Arthur RosingerMagnetic stirrerUS2655354 *Aug 29, 1947Oct 13, 1953Pollard & JohnstonMixer and processor for home use and the likeUS2958517 *Apr 28, 1958Nov 1, 1960Bellco Glass IncVessel for tissue culture and the like comprising a magnetic stirrerUS3116913 *May 29, 1961Jan 7, 1964Kingdon LaneLiquid agitating apparatusUS3138370 *Mar 4, 1963Jun 23, 1964Thermolyne CorpMagnetic stirring deviceUS3384353 *May 31, 1967May 21, 1968Cole Parmer Instr & EquipmentMagnetic stirrerUS3554497 *Jun 21, 1968Jan 12, 1971Zipperer ManfredElectronically controlled magnetic stirrerUS4162855 *Mar 4, 1977Jul 31, 1979Spectroderm International, Inc.Magnetic stirrer apparatusDE3402041A1 *Jan 21, 1984Jul 25, 1985Janke & Kunkel KgMagnetic stirrerDE7041043U *Nov 5, 1970Feb 18, 1971Klitzing LUnterwasser-magnetruehrer mit synchronmotorJPS63151342A * Title not availableSU1629081A1 * Title not available* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS5899567 *Sep 23, 1997May 4, 1999Morris, Jr.; Joseph E.Magnetic synchronized stirring and heating test apparatusUS6382827Nov 1, 2000May 7, 2002Dade Behring Inc.Method and apparatus for mixing liquid solutions using a rotating magnet to generate a stirring vortex actionUS6467946Apr 24, 2001Oct 22, 2002Dade Microscan Inc.Method and apparatus for mixing liquid samples in a container using rotating magnetic fieldsUS6988825Jul 2, 2003Jan 24, 2006Bio/Data CorporationMethod and apparatus for using vertical magnetic stirring to produce turbulent and chaotic mixing in various states, without compromising componentsUS7075040Aug 20, 2004Jul 11, 2006Barnstead/Thermolyne CorporationStirring hot plateUS7364350Jan 24, 2006Apr 29, 2008Bio/Data CorporationMethod and apparatus for using vertical magnetic stirring to produce turbulent and chaotic mixing in various states, without compromising componentsUS7494267 *Aug 30, 2005Feb 24, 2009Chemglass, Inc.Reaction block for supporting flasks of different sizes for chemical synthesis on a hot plate stirrerUS7919731Oct 30, 2007Apr 5, 2011Barnstead/Thermolyne CorporationStirring hot plateUS8480292 *Jun 1, 2010Jul 9, 2013Boris DushineSystems, apparatus and methods to reconstitute dehydrated drinksUS20110293807 *Jun 1, 2010Dec 1, 2011Boris DushineSystems, apparatus and methods to reconstitute dehydrated drinks* Cited by examinerClassifications U.S. Classification366/274International ClassificationB01F13/08Cooperative ClassificationB01F13/0818European ClassificationB01F13/08CLegal EventsDateCodeEventDescriptionOct 7, 2008FPExpired due to failure to pay maintenance feeEffective date: 20080820Aug 20, 2008LAPSLapse for failure to pay maintenance feesFeb 25, 2008REMIMaintenance fee reminder mailedSep 12, 2006ASAssignmentOwner name: IKA-WERKE GMBH & CO. KG, GERMANYFree format text: CHANGE OF NAME;ASSIGNOR:JANKE & KUNKEL GMBH & CO. KG IKA-LABORTECHNIK;REEL/FRAME:018231/0542Effective date: 19990105Aug 3, 2006ASAssignmentOwner name: IKA-WERKE GMBH & CO. KG, GERMANYFree format text: CHANGE OF NAME;ASSIGNOR:JANKE & KUNKEL GMBH & CO. KG IKA-LABORTECHNIK;REEL/FRAME:018039/0945Effective date: 19990105Dec 18, 2003FPAYFee paymentYear of fee payment: 8Dec 29, 1999FPAYFee paymentYear of fee payment: 4Jun 29, 1995ASAssignmentOwner name: JANKE & KUNKEL GMBH & CO. KG IKA-LABORTECHNIK, A CFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:WANNINGER, PETER, HEIR OF ALFRED WANNINGER, DECEASED;WANNINGER, HANNA MARIA, HEIR OF ALFRED WANNINGER, DECEASED;REEL/FRAME:007545/0024Effective date: 19950512RotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google