EP0669160B1 - Magnetic mixer with its casing - Google Patents

Magnetic mixer with its casing Download PDF

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Publication number
EP0669160B1
EP0669160B1 EP94120499A EP94120499A EP0669160B1 EP 0669160 B1 EP0669160 B1 EP 0669160B1 EP 94120499 A EP94120499 A EP 94120499A EP 94120499 A EP94120499 A EP 94120499A EP 0669160 B1 EP0669160 B1 EP 0669160B1
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EP
European Patent Office
Prior art keywords
magnetic mixer
control knob
edge
glass
widening
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
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EP94120499A
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German (de)
French (fr)
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EP0669160A1 (en
Inventor
Alfred Wanninger
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.)
Janke & Kunkel & Co KG Ika-Labortechnik GmbH
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Janke & Kunkel & Co KG Ika-Labortechnik GmbH
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Publication of EP0669160A1 publication Critical patent/EP0669160A1/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01FMIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00Other mixers; Mixing plants; Combinations of mixers
    • B01F33/45Magnetic mixers; Mixers with magnetically driven stirrers
    • B01F33/452Magnetic mixers; Mixers with magnetically driven stirrers using independent floating stirring elements

Definitions

  • the invention relates to a magnetic stirrer with a housing which has a lower part and an upper part which can be connected to it, the drive motor with its control and the electrical connection being arranged in the lower part and the upper part which can be attached to it on the upper side of the mounting surface for a stirring vessel containing the stirring magnet forms.
  • the upper part of the housing can also be the installation surface for the mixing vessel.
  • this consists of plastic, so that in the case of an aggressive medium to be stirred, there is a risk that this upper part will be damaged by overflowing constituents or substances or also by aggressive vapors released during stirring. If the outside of the vessel is wetted with the aggressive medium to be stirred, the base will be exposed to this medium for a correspondingly long time and may be irreparably destroyed.
  • a magnetic stirrer with a housing which is constructed in several parts and has a cover plate made of glass on the upper side, but which is smaller than the upper side, so that a metallic upper side is present laterally from its edge .
  • the cover plate In the position of use, the cover plate is largely covered by the stirring vessel, so that there is also the risk that the upper side, at least outside the glass plate, is exposed to corrosion due to aggressive media.
  • the construction of the entire housing is complex and the attachment of the cover plate made of glass can cause difficulties because different expansion coefficients of this plate on the one hand and of the housing upper part receiving it on the other hand may have to be taken into account.
  • the upper part is made of glass, that the upper part is cap-shaped or bowl-shaped and has a bead, flange or widening on its lower, free, peripheral edge in the position of use and presses it sealingly against a counter surface of the lower part and that the counter surface is provided with an undercut for receiving the widening.
  • Glass is a sufficiently stable material to serve as a footprint for the mixing vessel, which is usually also made of glass, and can withstand aggressive media such as the mixing vessel made of glass.
  • a glass upper part can be manufactured inexpensively, especially since glass is an inexpensive material.
  • the cap-shaped or bowl-shaped design of the upper part made of glass and the bulge, flange or widening located on the free edge result in a particularly good seal in cooperation with the corresponding seat of the lower part with its undercut, which can accommodate the widening in a form-fitting manner.
  • Another advantage is that the glass upper part can be replaced very easily and inexpensively by a new upper part of this type in the event of damage or destruction, especially since the assembly is also very simple.
  • edge to be connected to the lower part this upper part made of glass so shaped and so smooth that a sufficient seal is created by pressing on the lower part.
  • the lower part of the device consists of a somewhat resilient material.
  • the counter surface adapts to the upper part when pressed against it, even if there are slight dimensional deviations, so that the sealing effect is improved.
  • the seat for the edge can be sunk inside the lower part, so that a sealing surface forms both on the end face of the edge of the glass part and on the widening and finally over part of the height on the side surface of the glass upper part.
  • the glass upper part can be pressed against its seat from above, although the widening is excessive compared to the uppermost opening of the upper part.
  • the upper opening of the lower part should lie under pressure on the outside of the glass upper part. This results in a sealing seat that is also impermeable to vapors along the connecting line between the lower part and the upper part.
  • the side wall of the upper part made of glass can have a recess for the passage of a rotary knob shaft, so that the device can be changed from the outside, for example with respect to the engine speed. It is useful if the knob bearing itself is provided on the lower part and protrudes so far over the upper part that the recess for the rotary shaft covers and is also sealed on the outside of the upper part.
  • the knob with the shaft attached to it can with his Outside edge on the knob bearing of the lower part of the housing can be rotatably locked.
  • the rotary knob bearing of the lower part has a circumferential groove and the rotary knob has a circumferential edge or bead which fits into the groove and can be locked with this groove. Since the groove and bead run in a circle, the knob can be turned to change the engine speed despite this locking.
  • the use of glass has the advantage that the upper part can be made transparent and thus also enables the user to visually check the motor located inside.
  • this upper part in particular on the inside, that is to say providing a coating in the sealed space and thus separate from aggressive media.
  • This has the advantage that, due to such a coating, the device can be designed to be optically different and appealing, depending on the use of colors, graphics and patterns, and for example inscriptions, the brand or instructions can be well protected and attached in a clearly visible manner.
  • the glass upper part cannot be accidentally pulled out of its sealing seat or can fall out, it can be glued to the lower part. This can further improve the seal, although it must be accepted that it is more difficult to replace the upper part.
  • the glass top has the advantage that it can be easily recycled for recycling.
  • the shaft of the rotary knob can be coupled with an adjustable potentiometer, the change of which the speed of the motor changed. If the rotary shaft is turned too far, the potentiometer, which only allows a limited angle of rotation, could be torn out of its holder. On the one hand, this can be recognized by the glass hood and, on the other hand, a design of the rotatable knob is possible in such a way that a stop limiting this rotation path to the highest angle of rotation of the potentiometer is provided on its rotation path.
  • the rotary shaft can be designed so thin or weak that it allows torsion and thus reaching the rotary stop when the stop within the potentiometer and before the rotary knob stops, before the holder of the potentiometer is overloaded is.
  • a magnetic stirrer of great performance which is also easy to keep small in size, which is chemically highly resistant, can be manufactured inexpensively due to the low technical outlay, requires few individual parts and is overall very reliable can be.
  • a magnetic stirrer designated as a whole has a housing 2, which is composed of two parts, namely a lower part 3 and an upper part 4, wherein in the lower part 3 a drive motor 5 with control and the like and also with the electrical connection are arranged and this Drive motor 5 has magnets 6, with which a stirring magnet, not shown, can be rotated in a stirring vessel.
  • the upper part 4 is fastened to the lower part 3 and the upper side 7 of this upper part 4 is the mounting surface for a stirring vessel containing the stirring magnet, which often consists of glass.
  • the upper part 4 of this magnetic stirrer 1 is also made of glass and its edges are self-sealingly pressed onto the lower part 3 of the housing 2 in a manner to be described.
  • edge 8 of the upper part 4 which is made of glass and which is to be connected to the lower part 3 is so smooth that a good sealing effect is achieved by pressing on a corresponding counter surface 9 of the lower part 4.
  • the lower part 4 can consist of a somewhat resilient material, so that the edge 8 and the counter surface 9 can also adapt to mutual slight dimensional deviations when compressed, thereby producing the aforementioned sealing effect.
  • the upper part 3 made of glass is cap-shaped or bowl-shaped, the "bottom” of this "bowl” is directed upwards in the position of use and forms the installation surface 7.
  • the lower free peripheral edge 8 in this position of use has a widening 10 approximately in the form of a flange, which radially outwards relative to the outside of the upper part 4 protrudes.
  • the lower part 3 has in the area of the counter surface 9 an annular undercut 11, which in the position of use receives the aforementioned widening 10 in a form-fitting manner.
  • the counter surface 9 is recessed as a seat for the edge 8 within the lower part 3, so that there is a sealing surface both on the edge 8 of the upper part 4 made of glass and on the widening and on the widening of the upper part 4 adjacent to this widening .
  • the glass upper part 4 can be pressed into its use position from above and locked with its widening 10 in the undercut 11, although this widening is excessive compared to the actual upper opening of the lower part 3 .
  • the opening of the lower part 3 rests under pressure on the outside of the upper part 4 and causes the sealing seat, which is impenetrable for vapors, along the contacting surfaces between the lower part 3 and the upper part 4.
  • the side wall of the upper part 4 has a recess 12 for the passage of a knob shaft 13, which is shown separately in Fig. 4 together with the knob 14.
  • the magnetic stirrer 1 can be changed from the outside, for example with respect to the motor speed, via the rotary knob shaft 13.
  • the rotary knob bearing 15 itself is provided on the lower part 3, as can be seen in FIGS. 1 and 3.
  • This knob bearing 15 stands high with respect to the lower part and thus projects laterally beyond the upper part 4 to such an extent that the recess 12 provided there for the knob shaft 13 is covered and also sealed with a corresponding system on the outside of the upper part 4.
  • This protrusion and abutting the rotary knob bearing 15 on the outside of the upper part 4 can be seen above all in FIG. 1 but also in FIG. 2, where one recognizes the adaptation of this rotary knob bearing 15 to the circular contour of the upper part 4 in the exemplary embodiment.
  • the rotary knob 14 is rotatably locked with the rotary knob shaft 13 attached to it with its outer edge 14a on the rotary knob bearing 15 of the lower part 3 of the housing 2.
  • the actual knob shaft 13 is in turn inserted into a corresponding receptacle of the knob 14 and fixed in a clamped or glued manner, so that the shaft 13 itself is made of metal, but the knob 14 is made of plastic can exist.
  • the knob bearing 15 has a circumferential groove 16 and the knob 14 has the circumferential edge 14a or bead which fits into the groove 16 and which is latched to the groove 16. This results in a very simple assembly and also easy disassembly. Since the groove 16 and the rim or bead 14a run in a circle, the rotary knob 14 with its central rotary knob shaft 13 can be rotated in spite of this locking, for example to change the engine speed.
  • connection between the upper part 4 and lower part 3 can be further improved in that these parts are glued together. At the same time, the seal is also improved.
  • the shaft 13 of the rotary knob 14 is coupled to an adjustable potentiometer 18, the change of which acts accordingly on the speed of the motor.
  • the potentiometer 18 which only allows a limited angle of rotation, could be damaged or torn from its holder.
  • the user can control this well, since the upper part 4 is made of glass and can thus be transparent, but in the exemplary embodiment there is also a safeguard against such damage in that the rotary knob 14 has a rotation path that is the highest permissible on its rotation path
  • Rotation angle of the potentiometer 18 limiting stop 20 is provided.
  • the stop 20 can be seen as an inside projection in the rotary knob in FIGS. 4 and 5. It projects into a corresponding cutout 21 of the rotary knob bearing 14, which cutout limits the predetermined angle of approximately 270 ° on both sides. This cutout, which extends over the larger part of the circumference of the rotary knob bearing 14 or a stop projection 22 protruding into this cutout, can be clearly seen in FIG.
  • the magnetic stirrer 1 has a two-part housing 2, the lower part 3 containing the necessary drive means, namely a drive motor 5 and its control means, while the upper part 4 forms the mounting surface for a stirring vessel receiving a stirring magnet, the separating surface of the two parts 3 and 5 in Use position runs approximately horizontally.
  • the upper part 4 of this housing 2 is made of glass and the edge 9 of this upper part 4 is pressed tightly against a counter surface 9 of the lower part 3 in the position of use, possibly even glued.
  • the edge 8 can have a widening 10, which snaps into a corresponding undercut 11 of the lower part 3. This results in a very simple and inexpensive construction of the magnetic stirrer 1 which is nevertheless tight and insensitive to aggressive vapors.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
  • Food-Manufacturing Devices (AREA)

Description

Die Erfindung betrifft einen Magnetrührer mit einem Gehäuse, welches ein Unterteil und ein damit verbindbares Oberteil aufweist, wobei in dem Unterteil der Antriebsmotor mit seiner Steuerung und dem elektrischen Anschluß angeordnet sind und der daran anbringbare Oberteil an seiner Oberseite die Aufstellfläche für ein den Rührmagneten enthaltendes Rührgefäß bildet.The invention relates to a magnetic stirrer with a housing which has a lower part and an upper part which can be connected to it, the drive motor with its control and the electrical connection being arranged in the lower part and the upper part which can be attached to it on the upper side of the mounting surface for a stirring vessel containing the stirring magnet forms.

Derartige Magnetrührer sind aus der Praxis bereits bekannt. Da sie in der Regel keine Heizung enthalten, kann das Oberteil des Gehäuses gleichzeitig die Aufstellfläche für das Rührgefäß sein. In der Regel besteht dieses aus Kunststoff, so daß im Falle eines zu rührenden aggressiven Mediums die Gefahr besteht, daß dieser Oberteil durch überlaufende Bestandteile oder Substanzen oder auch durch beim Rühren freiwerdende aggressive Dämpfe beschädigt wird. Falls das Gefäß an seiner Außenseite mit dem zu rührenden aggressiven Medium benetzt ist, wird die Standfläche entsprechend lange diesem Medium ausgesetzt und dadurch unter Umständen irreparabel zerstört.Such magnetic stirrers are already known in practice. Since they usually do not contain any heating, the upper part of the housing can also be the installation surface for the mixing vessel. As a rule, this consists of plastic, so that in the case of an aggressive medium to be stirred, there is a risk that this upper part will be damaged by overflowing constituents or substances or also by aggressive vapors released during stirring. If the outside of the vessel is wetted with the aggressive medium to be stirred, the base will be exposed to this medium for a correspondingly long time and may be irreparably destroyed.

Es wurde deshalb schon versucht, ein emailliertes Oberteil zu verwenden, was jedoch den Nachteil hat, daß es schlagempfindlich ist und eine teure Herstellung bedeutet.An attempt has therefore already been made to close an enamelled top use, however, has the disadvantage that it is sensitive to impact and means an expensive manufacture.

Darüber hinaus besteht bei all diesen bekannten Lösungen ein Abdichtproblem zwischen Oberteil und Unterteil, wobei die Abdichtung in der Regel durch eine möglichst genaue Zusammenfügung von Unterteil und Oberteil und eventuell eine dabei vorgesehene Labyrinthdichtung erzeugt wird. Dadurch kann ein aggressives verdampftes Medium in das Geräteinnere eindringen.In addition, in all of these known solutions there is a sealing problem between the upper part and the lower part, the sealing generally being produced by the most accurate possible joining of the lower part and the upper part and possibly a labyrinth seal provided in the process. This allows an aggressive vaporized medium to penetrate inside the device.

Eine weitere Lösung sieht ein Oberteil aus Edelstahl vor, bei welchem ähnliche Abdichtprobleme auftreten und bei sehr aggressiven Medien trotz des verwendeten Werkstoffes eine Korrosionsgefahr besteht. Dennoch ist ein solches Gerät aufgrund des verwendeten Werkstoffes sehr teuer.Another solution is provided by a top part made of stainless steel, in which similar sealing problems occur and, in the case of very aggressive media, there is a risk of corrosion despite the material used. Nevertheless, such a device is very expensive due to the material used.

Aus der US-A-3 138 370 ist ein Magnetrührer mit einem Gehäuse bekannt, das mehrteilig aufgebaut ist und an der Oberseite eine Deckplatte aus Glas aufweist, die aber kleiner als die Oberseite ist, so daß seitlich von ihrem Rand eine metallische Oberseite vorhanden ist. Die Deckplatte wird in Gebrauchsstellung von dem Rührgefäß weitgehend abgedeckt, so daß auch dabei die Gefahr besteht, daß die Oberseite zumindest außerhalb der Glasplatte einer Korrosion aufgrund aggressiver Medien ausgesetzt ist. Darüber hinaus ist der Aufbau des gesamten Gehäuses aufwendig und die Befestigung der aus Glas bestehenden Deckplatte kann Schwierigkeiten nach sich ziehen, weil eventuell unterschiedliche Ausdehnungskoeffizienten dieser Platte einerseits und des sie aufnehmenden Gehäuseoberteiles andererseits berücksichtigt werden müssen. Ferner ergeben sich Schwierigkeiten bei der Reparatur, wenn die Glasplatte beschädigt oder zerstört wird, weil dann an dem Oberteil eine neue derartige Abdeckplatte eingefügt werden müsste.From US-A-3 138 370 a magnetic stirrer with a housing is known, which is constructed in several parts and has a cover plate made of glass on the upper side, but which is smaller than the upper side, so that a metallic upper side is present laterally from its edge . In the position of use, the cover plate is largely covered by the stirring vessel, so that there is also the risk that the upper side, at least outside the glass plate, is exposed to corrosion due to aggressive media. In addition, the construction of the entire housing is complex and the attachment of the cover plate made of glass can cause difficulties because different expansion coefficients of this plate on the one hand and of the housing upper part receiving it on the other hand may have to be taken into account. Furthermore, there are difficulties in the repair if the glass plate is damaged or destroyed because a new cover plate of this type would then have to be inserted on the upper part.

Es besteht deshalb die Aufgabe, einen Magnetrührer der eingangs erwähnten Art zu schaffen, bei welchem die Aufstellfläche weitgehend unempfindlich gegen aggressive Medien, insbesondere Flüssigkeiten, aber auch Dämpfe ist, trotzdem preiswert hergestellt und im Falle einer Beschädigung oder Zerstörung leicht und preiswert ersetzt werden kann und eine einfache und wirkungsvolle Abdichtung gegenüber dem Unterteil erlaubt.There is therefore the task of a magnetic stirrer at the beginning To create mentioned type, in which the footprint is largely insensitive to aggressive media, especially liquids, but also vapors, can still be inexpensively manufactured and easily and inexpensively replaced in the event of damage or destruction and allows a simple and effective seal against the lower part.

Die Lösung dieser Aufgabe besteht darin, daß das Oberteil aus Glas besteht, daß das Oberteil kappen- oder schüsselförmig ausgebildet ist und an seinem in Gebrauchsstellung unteren, freien, umlaufenden Rand einen Wulst, Flansch oder eine Verbreiterung hat und dichtend an eine Gegenfläche des Unterteiles angedrückt ist und daß die Gegenfläche mit einer Hinterschneidung zur Aufnahme der Verbreiterung vorgesehen ist.The solution to this problem is that the upper part is made of glass, that the upper part is cap-shaped or bowl-shaped and has a bead, flange or widening on its lower, free, peripheral edge in the position of use and presses it sealingly against a counter surface of the lower part and that the counter surface is provided with an undercut for receiving the widening.

Glas ist ein ausreichend stabiler Werkstoff, um als Aufstellfläche für das in der Regel ebenfalls aus Glas bestehende Rührgefäß zu dienen und kann aggressiven Medien wie das aus Glas bestehende Rührgefäß widerstehen. Dabei kann ein solches Glasoberteil preiswert hergestellt werden, zumal Glas ein preiswerter Werkstoff ist. Durch die kappen- oder schüsselförmige Ausbildung des aus Glas bestehenden Oberteiles und den am freien Rand befindlichen Wulst, Flansch oder die Verbreiterung ergibt sich eine besonders gute Abdichtung im Zusammenwirken mit dem entsprechenden Sitz des Unterteiles mit seiner Hinterschneidung, die die Verbreiterung formschlüssig aufnehmen kann. Es werden dadurch praktisch mehrere ringartige Dichtflächen geschaffen, die einander benachbart sind und ein Eindringen aggressiver Dämpfe in das Innere des Magnetrührers ausschließen können. Ein weiterer Vorteil besteht dabei darin, daß das Glas-Oberteil bei einer Beschädigung oder Zerstörung sehr leicht und preiswert durch ein neues derartiges Oberteil ersetzt werden kann, zumal auch die Montage sehr einfach ist.Glass is a sufficiently stable material to serve as a footprint for the mixing vessel, which is usually also made of glass, and can withstand aggressive media such as the mixing vessel made of glass. Such a glass upper part can be manufactured inexpensively, especially since glass is an inexpensive material. The cap-shaped or bowl-shaped design of the upper part made of glass and the bulge, flange or widening located on the free edge result in a particularly good seal in cooperation with the corresponding seat of the lower part with its undercut, which can accommodate the widening in a form-fitting manner. This practically creates several ring-like sealing surfaces which are adjacent to one another and can rule out the penetration of aggressive vapors into the interior of the magnetic stirrer. Another advantage is that the glass upper part can be replaced very easily and inexpensively by a new upper part of this type in the event of damage or destruction, especially since the assembly is also very simple.

Darüber hinaus kann der mit dem Unterteil zu verbindende Rand dieses aus Glas bestehenden Oberteiles so geformt und derart glatt sein, daß bei einem Andrücken an das Unterteil von selbst eine ausreichende Dichtung entsteht.In addition, the edge to be connected to the lower part this upper part made of glass so shaped and so smooth that a sufficient seal is created by pressing on the lower part.

Besonders zweckmäßig ist es dabei, wenn das Unterteil des Gerätes aus einem elastisch etwas nachgiebigen Werkstoff besteht. Somit paßt sich die Gegenfläche beim Andrücken des Oberteiles an dieses an, selbst wenn geringfügige Maßabweichungen vorhanden sind, so daß die Dichtwirkung verbessert wird.It is particularly expedient if the lower part of the device consists of a somewhat resilient material. Thus, the counter surface adapts to the upper part when pressed against it, even if there are slight dimensional deviations, so that the sealing effect is improved.

Dabei kann der Sitz für den Rand innerhalb des Unterteiles versenkt sein, so daß sich eine Dichtfläche sowohl an der Stirnseite des Randes des Glasteiles als auch an der Verbreiterung als auch schließlich noch über einen Teil der Höhe an der Seitenfläche des Glas-Oberteiles bildet.The seat for the edge can be sunk inside the lower part, so that a sealing surface forms both on the end face of the edge of the glass part and on the widening and finally over part of the height on the side surface of the glass upper part.

Da das Unterteil aus einem etwas nachgiebigen Werkstoff besteht, kann das Glas-Oberteil von oben her gegen seinen Sitz gedrückt werden, obwohl die Verbreiterung gegenüber der obersten Öffnung des Oberteiles ein Übermaß hat. In Gebrauchsstellung soll die obere Öffnung des Unterteiles unter Druck an der Außenseite des Glasoberteiles anliegen. Auf diese Weise ergibt sich ein auch für Dämpfe undurchdringlicher Dichtsitz entlang der Verbindungslinie zwischen Unterteil und Oberteil.Since the lower part is made of a somewhat flexible material, the glass upper part can be pressed against its seat from above, although the widening is excessive compared to the uppermost opening of the upper part. In the position of use, the upper opening of the lower part should lie under pressure on the outside of the glass upper part. This results in a sealing seat that is also impermeable to vapors along the connecting line between the lower part and the upper part.

Die Seitenwand des aus Glas bestehenden Oberteiles kann eine Aussparung für den Durchtritt einer Drehknopfwelle haben, so daß das Gerät von außen her beispielsweise bezüglich der Motordrehzahl verändert werden kann. Dabei ist es zweckmäßig, wenn die Drehknopflagerung selbst an dem Unterteil vorgesehen ist und so weit über das Oberteil übersteht, daß die Aussparung für die Drehwelle überdeckt und an der Außenseite des Oberteiles ebenfalls abgedichtet ist.The side wall of the upper part made of glass can have a recess for the passage of a rotary knob shaft, so that the device can be changed from the outside, for example with respect to the engine speed. It is useful if the knob bearing itself is provided on the lower part and protrudes so far over the upper part that the recess for the rotary shaft covers and is also sealed on the outside of the upper part.

Der Drehknopf mit der an ihm befestigten Welle kann mit seinem Außenrand an der Drehknopflagerung des Unterteiles des Gehäuses drehbar verrastet sein.The knob with the shaft attached to it can with his Outside edge on the knob bearing of the lower part of the housing can be rotatably locked.

Besonders einfach ist dies erreichbar, wenn die Drehknoflagerung des Unterteiles eine umlaufende Rille und der Drehknopf einen umlaufenden, in die Rille passenden Rand oder Wulst hat, der mit dieser Rille verrastbar ist. Da Rille und Wulst auf einem Kreis umlaufen, kann der Drehknopf trotz dieser Verrastung zur Veränderung der Motordrehzahl verdreht werden.This can be achieved particularly easily if the rotary knob bearing of the lower part has a circumferential groove and the rotary knob has a circumferential edge or bead which fits into the groove and can be locked with this groove. Since the groove and bead run in a circle, the knob can be turned to change the engine speed despite this locking.

Es sei noch erwähnt, daß die Verwendung von Glas den Vorteil hat, daß das Oberteil durchsichtig gestaltet werden kann und somit für den Benutzer auch eine optische Kontrolle des im Inneren befindlichen Motors ermöglicht. Es besteht aber auch die Möglichkeit, dieses Oberteil insbesondere innenseitig zu beschichten, also eine Beschichtung im abgedichteten Raum und somit von aggresiven Medien getrennt vorzusehen. Dies hat den Vorteil, daß das Gerät aufgrund einer solchen Beschichtung je nach Verwendung von Farben, Grafiken und Mustern optisch unterschiedlich und ansprechend gestaltet werden kann und beispielsweise auch Beschriftungen, die Marke oder Hinweise gut geschützt und gut sichtbar angebracht werden können.It should also be mentioned that the use of glass has the advantage that the upper part can be made transparent and thus also enables the user to visually check the motor located inside. However, there is also the possibility of coating this upper part in particular on the inside, that is to say providing a coating in the sealed space and thus separate from aggressive media. This has the advantage that, due to such a coating, the device can be designed to be optically different and appealing, depending on the use of colors, graphics and patterns, and for example inscriptions, the brand or instructions can be well protected and attached in a clearly visible manner.

Damit das Glas-Oberteil nicht versehentlich aus seinem Dichtsitz herausgezogen werden kann oder herausfallen kann, kann es mit dem Unterteil verklebt sein. Dadurch kann die Abdichtung weiter verbessert werden, wobei allerdings in Kauf genommen werden muß, daß ein Ersetzen des Oberteiles schwieriger ist.So that the glass upper part cannot be accidentally pulled out of its sealing seat or can fall out, it can be glued to the lower part. This can further improve the seal, although it must be accepted that it is more difficult to replace the upper part.

Falls das Gerät nicht mehr reparabel ist, hat das Glasoberteil den Vorteil, auf einfache Weise einer Wiederverwertung Recyclingzugeführt werden zu können.If the device is no longer repairable, the glass top has the advantage that it can be easily recycled for recycling.

Die Welle des Drehknopfes kann mit einem einstellbaren Potentiometer gekuppelt sein, dessen Veränderung die Drehzahl des Motors verändert. Wird die Drehwelle zu weit gedreht, könnte dadurch der nur einen begrenzten Drehwinkel zulassende Potentiometer aus seiner Halterung gerissen werden. Einerseits kann dies durch die Glashaube erkannt werden und zum anderen ist eine Ausgestaltung des drehbaren Knopfes dahingehend möglich, daß auf seinem Drehweg ein diesen Drehweg auf den höchsten Drehwinkel des Potentiometers begrenzender Anschlag vorgesehen ist.The shaft of the rotary knob can be coupled with an adjustable potentiometer, the change of which the speed of the motor changed. If the rotary shaft is turned too far, the potentiometer, which only allows a limited angle of rotation, could be torn out of its holder. On the one hand, this can be recognized by the glass hood and, on the other hand, a design of the rotatable knob is possible in such a way that a stop limiting this rotation path to the highest angle of rotation of the potentiometer is provided on its rotation path.

Um dabei Montage- und Herstellungstoleranzen auszugleichen, kann die Drehwelle derart dünn oder schwach gestaltet sein, daß sie beim Anschlag innerhalb des Potentiometers und vor einem Anschlag des Drehknopfes an seiner Drehbegrenzung eine Torsion und damit ein Erreichen des Drehknopfanschlages erlaubt, bevor die Halterung des Potentiometers überlastet ist.In order to compensate for assembly and manufacturing tolerances, the rotary shaft can be designed so thin or weak that it allows torsion and thus reaching the rotary stop when the stop within the potentiometer and before the rotary knob stops, before the holder of the potentiometer is overloaded is.

Insgesamt ergibt sich vor allem bei Kombination einzelner oder mehrerer der vorbeschriebenen Merkmale und Maßnahmen ein auch in den Abmessungen auf einfache Weise kleinzuhaltender Magnetrührer großer Leistung, der chemisch hochbeständig ist, aufgrund des geringen technischen Aufwandes kostengünstig hergestellt werden kann, wenig Einzelteile benötigt und insgesamt sehr zuverlässig sein kann.All in all, especially when combining one or more of the features and measures described above, a magnetic stirrer of great performance, which is also easy to keep small in size, which is chemically highly resistant, can be manufactured inexpensively due to the low technical outlay, requires few individual parts and is overall very reliable can be.

Nachstehend ist ein Ausführungsbeispiel der Erfindung anhand der Zeichnung näher beschrieben.An embodiment of the invention is described below with reference to the drawing.

Es zeigt in zum Teil schematisierter Darstellung:

Fig.1
einen senkrechten Schnitt durch einen erfindungsgemäßen Magnetrührer mit einem zweiteiligen Gehäuse,
Fig.2
eine Draufsicht dieses Magnetrührers,
Fig. 3
eine Ansicht des Unterteiles des Magnetrührers mit der Lagerung für einen Drehknopf zum Verstellen der Drehzahl,
Fig. 4
einen Längsschnitt des Drehknopfes und
Fig. 5
eine Stirnansicht dieses Drehknopfes.
It shows in a partially schematic representation:
Fig. 1
2 shows a vertical section through a magnetic stirrer according to the invention with a two-part housing,
Fig. 2
a top view of this magnetic stirrer,
Fig. 3
a view of the lower part of the magnetic stirrer with the bearing for a rotary knob for adjusting the speed,
Fig. 4
a longitudinal section of the knob and
Fig. 5
an end view of this knob.

Ein im ganzen mit 1 bezeichneter Magnetrührer hat ein Gehäuse 2, welches aus zwei Teilen, nämlich einem Unterteil 3 und einem Oberteil 4 zusammengesetzt ist, wobei in dem Unterteil 3 ein Antriebsmotor 5 mit Steuerung und dergleichen und auch mit dem elektrischen Anschluß angeordnet sind und dieser Antriebsmotor 5 Magnete 6 aufweist, mit denen ein nicht näher dargestellter Rührmagnet in einem Rührgefäß in entsprechende Drehung versetzt werden kann. Das Oberteil 4 ist an dem Unterteil 3 befestigt und die Oberseite 7 dieses Oberteiles 4 ist die Aufstellfläche für ein den Rührmagneten enthaltendes Rührgefäß, welches häufig aus Glas besteht.A magnetic stirrer designated as a whole has a housing 2, which is composed of two parts, namely a lower part 3 and an upper part 4, wherein in the lower part 3 a drive motor 5 with control and the like and also with the electrical connection are arranged and this Drive motor 5 has magnets 6, with which a stirring magnet, not shown, can be rotated in a stirring vessel. The upper part 4 is fastened to the lower part 3 and the upper side 7 of this upper part 4 is the mounting surface for a stirring vessel containing the stirring magnet, which often consists of glass.

Auch das Oberteil 4 dieses Magnetrührers 1 besteht aus Glas und seine Ränder sind in noch zu beschreibender Weise selbstdichtend an dem Unterteil 3 des Gehäuses 2 angedrückt.The upper part 4 of this magnetic stirrer 1 is also made of glass and its edges are self-sealingly pressed onto the lower part 3 of the housing 2 in a manner to be described.

Vor allem in Fig.1 erkennt man, daß der mit dem Unterteil 3 zu verbindende Rand 8 des aus Glas bestehenden Oberteiles 4 derart glatt ist, daß bereits durch ein Andrücken an einer entsprechenden Gegenfläche 9 des Unterteiles 4 eine gute Dichtwirkung entsteht.Above all in FIG. 1 it can be seen that the edge 8 of the upper part 4 which is made of glass and which is to be connected to the lower part 3 is so smooth that a good sealing effect is achieved by pressing on a corresponding counter surface 9 of the lower part 4.

Dabei kann das Unterteil 4 aus etwas elastisch nachgiebigem Werkstoff bestehen, so daß sich der Rand 8 und die Gegenfläche 9 bei einem Zusammendrücken auch an gegenseitige geringfügige Maßabweichungen anpassen können und dadurch die erwähnte Dichtwirkung erzeugt wird.The lower part 4 can consist of a somewhat resilient material, so that the edge 8 and the counter surface 9 can also adapt to mutual slight dimensional deviations when compressed, thereby producing the aforementioned sealing effect.

In Fig.1 erkennt man, daß das aus Glas bestehende Oberteil 3 kappen- oder schüsselförmig ausgebildet ist, wobei der "Boden" dieser "Schüssel" in der Gebrauchsstellung nach oben gerichtet ist und die Aufstellfläche 7 bildet. Der in dieser Gebrauchsstellung untere freie umlaufende Rand 8 weist eine Verbreiterung 10 etwa in Form eines Flansches auf, die gegenüber der Außenseite des Oberteiles 4 radial nach außen vorsteht. Das Unterteil 3 hat im Bereich der Gegenfläche 9 eine ringförmig umlaufende Hinterschneidung 11, die in Gebrauchsstellung die erwähnte Verbreiterung 10 formschlüssig aufnimmt. Dabei ist die Gegenfläche 9 als Sitz für den Rand 8 innerhalb des Unterteiles 3 versenkt, so daß sich eine Dichtfläche sowohl an dem Rand 8 des aus Glas bestehenden Oberteiles 4 als auch an der Verbreiterung als auch an der dieser Verbreiterung benachbarten Außenseite des Oberteiles 4 ergibt. Somit sind praktisch mehrere ringartige Dichtflächen geschaffen, die einander benachbart sind und ein Eindringen aggressiver Dämpfe in das Innere des Magnetrührers 1 ausschließen.In Figure 1 it can be seen that the upper part 3 made of glass is cap-shaped or bowl-shaped, the "bottom" of this "bowl" is directed upwards in the position of use and forms the installation surface 7. The lower free peripheral edge 8 in this position of use has a widening 10 approximately in the form of a flange, which radially outwards relative to the outside of the upper part 4 protrudes. The lower part 3 has in the area of the counter surface 9 an annular undercut 11, which in the position of use receives the aforementioned widening 10 in a form-fitting manner. The counter surface 9 is recessed as a seat for the edge 8 within the lower part 3, so that there is a sealing surface both on the edge 8 of the upper part 4 made of glass and on the widening and on the widening of the upper part 4 adjacent to this widening . This practically creates a plurality of ring-like sealing surfaces which are adjacent to one another and prevent penetration of aggressive vapors into the interior of the magnetic stirrer 1.

Wenn dabei das Unterteil 3 aus nachgiebigem Werkstoff besteht, kann das aus Glas bestehende Oberteil 4 von oben her in seine Gebrauchsstellung gedrückt und mit seiner Verbreiterung 10 in der Hinterschneidung 11 verrastet werden, obwohl diese Verbreiterung gegenüber der eigentlichen oberen Öffnung des Unterteiles 3 ein Übermaß hat. In Gebrauchsstellung liegt auf diese Weise die Öffnung des Unterteiles 3 unter Druck an der Außenseite des Oberteiles 4 an und bewirkt den für Dämpfe undurchdringlichen Dichtsitz entlang den sich berührenden Flächen zwischen Unterteil 3 und Oberteil 4.If the lower part 3 is made of resilient material, the glass upper part 4 can be pressed into its use position from above and locked with its widening 10 in the undercut 11, although this widening is excessive compared to the actual upper opening of the lower part 3 . In the use position, the opening of the lower part 3 rests under pressure on the outside of the upper part 4 and causes the sealing seat, which is impenetrable for vapors, along the contacting surfaces between the lower part 3 and the upper part 4.

Gemäß Fig.1 hat die Seitenwand des Oberteiles 4 eine Aussparung 12 für den Durchtritt einer Drehknopfwelle 13, die in Fig. 4 noch einmal separat mit dem Drehknopf 14 zusammen dargestellt ist. Mit diesem Drehknopf 14 kann über die Drehknopfwelle 13 der Magnetrührer 1 von außen her beispielsweise bezüglich der Motordrehzahl verändert werden. Die Drehknopflagerung 15 selbst ist dabei an dem Unterteil 3 vorgesehen, wie man es in Fig.1 und 3 erkennt. Diese Drehknopflagerung 15 steht dabei gegenüber dem Unterteil hoch und überragt somit das Oberteil 4 seitlich soweit, daß die dort vorgesehene Aussparung 12 für die Drehknopfwelle 13 überdeckt und bei entsprechender Anlage an der Außenseite des Oberteiles 4 auch abgedichtet wird. Dieses Überragen und Aneinanderliegen der Drehknopflagerung 15 an der Außenseite des Oberteiles 4 erkennt man vor allem in Fig.1 aber auch in Fig.2, wo man die Anpassung dieser Drehknopflagerung 15 an die im Ausführungsbeispiel kreisrunde Kontur des Oberteiles 4 erkennt.According to Figure 1, the side wall of the upper part 4 has a recess 12 for the passage of a knob shaft 13, which is shown separately in Fig. 4 together with the knob 14. With this rotary knob 14, the magnetic stirrer 1 can be changed from the outside, for example with respect to the motor speed, via the rotary knob shaft 13. The rotary knob bearing 15 itself is provided on the lower part 3, as can be seen in FIGS. 1 and 3. This knob bearing 15 stands high with respect to the lower part and thus projects laterally beyond the upper part 4 to such an extent that the recess 12 provided there for the knob shaft 13 is covered and also sealed with a corresponding system on the outside of the upper part 4. This protrusion and abutting the rotary knob bearing 15 on the outside of the upper part 4 can be seen above all in FIG. 1 but also in FIG. 2, where one recognizes the adaptation of this rotary knob bearing 15 to the circular contour of the upper part 4 in the exemplary embodiment.

Gemäß Fig.1 ist der Drehknopf 14 mit der an ihm befestigten Drehknopfwelle 13 mit seinem Außenrand 14a an der Drehknoflagerung 15 des Unterteiles 3 des Gehäuses 2 drehbar verrastet. Dies stellt eine sehr einfache Art der Montage dar. Gemäß Fig.4 ist dabei die eigentliche Drehknopfwelle 13 ihrerseits in eine entsprechende Aufnahme des Drehknopfes 14 eingesteckt und klemmend oder geklebt fixiert, so daß die Welle 13 selbst aus Metall, der Drehknopf 14 aber aus Kunststoff bestehen können.According to FIG. 1, the rotary knob 14 is rotatably locked with the rotary knob shaft 13 attached to it with its outer edge 14a on the rotary knob bearing 15 of the lower part 3 of the housing 2. This represents a very simple type of assembly. According to FIG. 4, the actual knob shaft 13 is in turn inserted into a corresponding receptacle of the knob 14 and fixed in a clamped or glued manner, so that the shaft 13 itself is made of metal, but the knob 14 is made of plastic can exist.

Für die Verrastung hat die Drehknopflagerung 15 eine umlaufende Rille 16 und der Drehknopf 14 den umlaufenden, in die Rille 16 passenden Rand 14a oder Wulst, der mit der Rille 16 verrastet ist. Dies ergibt eine sehr einfache Montage und auch eine leichte Demontage. Da Rille 16 und Rand oder Wulst 14a auf einem Kreis umlaufen, kann der Drehknopf 14 mit seiner zentralen Drehknopfwelle 13 trotz dieser Verrastung zum Beispiel zur Veränderung der Motordrehzahl verdreht werden.For the latching, the knob bearing 15 has a circumferential groove 16 and the knob 14 has the circumferential edge 14a or bead which fits into the groove 16 and which is latched to the groove 16. This results in a very simple assembly and also easy disassembly. Since the groove 16 and the rim or bead 14a run in a circle, the rotary knob 14 with its central rotary knob shaft 13 can be rotated in spite of this locking, for example to change the engine speed.

Die Verbindung zwischen Oberteil 4 und Unterteil 3 kann noch dadurch verbessert sein, daß diese Teile miteinander verklebt sind. Gleichzeitig wird dadurch auch die Abdichtung verbessert.The connection between the upper part 4 and lower part 3 can be further improved in that these parts are glued together. At the same time, the seal is also improved.

Gemäß Fig.1 und 2 ist die Welle 13 des Drehknopfes 14 mit einem einstellbaren Potentiometer 18 gekuppelt, dessen Veränderung auf die Drehzahl des Motors entsprechend einwirkt.1 and 2, the shaft 13 of the rotary knob 14 is coupled to an adjustable potentiometer 18, the change of which acts accordingly on the speed of the motor.

Würde dabei die Drehknopfwelle 13 zu weit verdreht, könnte der nur einen begrenzten Drehwinkel zulassende Potentiometer 18 beschädigt oder aus seiner Halterung gerissen werden. Dies kann der Benutzer zwar gut kontrollieren, da das Oberteil 4 aus Glas besteht und somit durchsichtig sein kann, jedoch ist im Ausführungsbeispiel auch noch eine Sicherung gegen eine solche Beschädigung dadurch vorgesehen, daß der Drehknopf 14 auf seinem Drehweg eine diesen Drehweg auf den höchsten zulässigen Drehwinkel des Potentiometers 18 begrenzenden Anschlag 20 vorgesehen ist. Man erkennt den Anschlag 20 als innenseitigen Vorsprung in dem Drehknopf in Fig.4 und 5. Er ragt in einen entsprechenden Ausschnitt 21 der Drehknopflagerung 14, welcher Ausschnitt den vorgegebenen Winkel von etwa 270° beidseits begrenzt. In Fig.3 ist dieser Ausschnitt, der über den größeren Teil des Umfanges der Drehknopflagerung 14 reicht beziehungsweise ein in diesen Ausschnitt ragender Anschlagvorsprung 22 gut zu erkennen.If the knob shaft 13 were rotated too far, the potentiometer 18, which only allows a limited angle of rotation, could be damaged or torn from its holder. The user can control this well, since the upper part 4 is made of glass and can thus be transparent, but in the exemplary embodiment there is also a safeguard against such damage in that the rotary knob 14 has a rotation path that is the highest permissible on its rotation path Rotation angle of the potentiometer 18 limiting stop 20 is provided. The stop 20 can be seen as an inside projection in the rotary knob in FIGS. 4 and 5. It projects into a corresponding cutout 21 of the rotary knob bearing 14, which cutout limits the predetermined angle of approximately 270 ° on both sides. This cutout, which extends over the larger part of the circumference of the rotary knob bearing 14 or a stop projection 22 protruding into this cutout, can be clearly seen in FIG.

Der Magnetrührer 1 hat ein zweiteiliges Gehäuse 2, wobei das Unterteil 3 die erforderlichen Antriebsmittel, nämlich einen Antriebsmotor 5 und dessen Steuerungsmittel enthält, während das Oberteil 4 die Aufstellfläche für ein einen Rührmagnet aufnehmendes Rührgefäß bildet, wobei die Trennfläche der beiden Teile 3 und 5 in Gebrauchsstellung etwa horizontal verläuft. Das Oberteil 4 dieses Gehäuses 2 besteht dabei aus Glas und der Rand 9 dieses Oberteiles 4 ist in Gebrauchsstellung dicht an einer Gegenfläche 9 des Unterteiles 3 angedrückt, gegebenenfalls sogar angeklebt. Dabei kann der Rand 8 eine Verbreiterung 10 haben, die in eine entsprechende Hinterschneidung 11 des Unterteiles 3 einrastet. Dies ergibt einen sehr einfachen und preiswerten, trotzdem aber auch gegen aggressive Dämpfe dichten und unempfindlichen Aufbau des Magnetrührers 1.The magnetic stirrer 1 has a two-part housing 2, the lower part 3 containing the necessary drive means, namely a drive motor 5 and its control means, while the upper part 4 forms the mounting surface for a stirring vessel receiving a stirring magnet, the separating surface of the two parts 3 and 5 in Use position runs approximately horizontally. The upper part 4 of this housing 2 is made of glass and the edge 9 of this upper part 4 is pressed tightly against a counter surface 9 of the lower part 3 in the position of use, possibly even glued. The edge 8 can have a widening 10, which snaps into a corresponding undercut 11 of the lower part 3. This results in a very simple and inexpensive construction of the magnetic stirrer 1 which is nevertheless tight and insensitive to aggressive vapors.

Claims (15)

  1. A magnetic mixer (1) comprising a casing (2) that has a lower part (3) and an upper part (4) connectable thereto, wherein the drive motor (5) with its controlling means and the electrical connection as well as the driven magnet (6) are arranged in the lower part, and the top side of the upper part (4) attachable thereto forms the mounting surface (7) for a mixing vessel that holds the mixing magnet, characterized in that the upper part (4) is made of glass, that the upper part (4) is of cupped or bowl-shaped configuration and the free circumferential edge (8) thereof, which is situated in a lower position in use, has a bead, flange or a widening (10), and is sealingly pressed against an opposing surface (9) of the lower part (3), and that the opposing surface (9) is provided with an undercut (11) for receiving the widening (10).
  2. A magnetic mixer as claimed in claim 1, characterized in that, in the use position, the edge (8) and the opposing surface (9) are arranged in a plane that is horizontal and parallel to the mounting surface (7).
  3. A magnetic mixer as claimed in claim 1 or claim 2, characterized in that the edge (8), which forms part of the glass upper part (4) and co-operates with the lower part (3) in the use position, is formed in such a way and is so smooth that a sufficient sealing action is automatically constituted when pressed against the lower part (3).
  4. A magnetic mixer as claimed in any one of claims 1 to 3, characterized in that the lower part (3) of the magnetic mixer (1) is made of a material that is elastically somewhat flexible, particularly plastic or synthetic rubber.
  5. A magnetic mixer as claimed in any one of claims 1 to 4, characterized in that the opposing surface (9) as the seat for the edge (8) is sunk within the lower part (3) and a sealing surface is provided at the edge (8) of the widening (10).
  6. A magnetic mixer as claimed in claim 5, characterized in that the sealing surface is provided at the edge (8) at the outside of the glass upper part (4) adjacent to the widening (10).
  7. A magnetic mixer as claimed in any one of claims 1 to 6, characterized in that since the lower part is made of a flexible material, the upper part (4) is pressed from above against its seat formed by the opposing surface (9).
  8. A magnetic mixer as claimed in any one of claims 1 to 7, characterized in that the side wall of the upper part (4) has a recess (12) for a control knob shaft (13) to pass through, and the magnetic mixer (1) is changeable from the outside, for example with respect to the motor speed.
  9. A magnetic mixer as claimed in claim 8, characterized in that the control knob bearing support (15) is provided on the lower part (3) and projects sufficiently over the side of the upper part (4) that the recess (12) for the rotating shaft (13) is covered and is sealed at the outside of the upper part (4).
  10. A magnetic mixer as claimed in claim 9, characterized in that a control knob (14) is provided having an outer edge (14a) which rotatably interlocks with the control knob bearing support (15) of the lower part (3) of the casing (2).
  11. A magnetic mixer as claimed in claim 10, characterized in that control knob bearing support (15) of the lower part (3) has a circumferential groove (16), and the control knob (14) has a circumferential edge (14a) or bead that fits into and is interlockable with the groove (16).
  12. A magnetic mixer as claimed in any one of claims 1 to 11, characterized in that the inside of the upper part has a coating, for example lettering, a brand name or instructions or the like.
  13. A magnetic mixer as claimed in any one of claims 1 to 12, characterized in that the upper part (4) is adherently joined, particularly bonded, to the lower part (3).
  14. A magnetic mixer as claimed in any one of claims 10 to 13, characterized in that the shaft (13) of the control knob is coupled with an adjustable potentiometer (18), and provided in the path of rotation of the control knob (14) is a limit stop (20) that limits said rotation path to the maximum angle of rotation of the potentiometer (18).
  15. A magnetic mixer as claimed in claim 14, characterized in that the shaft (13) of the control knob is thin or weak in such a way that when the potentiometer is at its limit stop and before the limit stop (20) for the control knob (14) has been reached, said shaft is inherently twistable or elastically deformable by torsion so that the control knob strikes against the limit stop (20) thereof before the mounting of the potentiometer (18) is overloaded.
EP94120499A 1994-02-25 1994-12-23 Magnetic mixer with its casing Expired - Lifetime EP0669160B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4406217A DE4406217C2 (en) 1994-02-25 1994-02-25 Magnetic stirrer with a housing
DE4406217 1994-02-25

Publications (2)

Publication Number Publication Date
EP0669160A1 EP0669160A1 (en) 1995-08-30
EP0669160B1 true EP0669160B1 (en) 1997-03-12

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US (1) US5547280A (en)
EP (1) EP0669160B1 (en)
JP (1) JP3683301B2 (en)
DE (2) DE4406217C2 (en)
ES (1) ES2098860T3 (en)

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US20020118594A1 (en) * 2001-02-28 2002-08-29 Vellinger John C. Apparatus and method for mixing small volumes of liquid
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US6988825B2 (en) * 2002-07-03 2006-01-24 Bio/Data Corporation Method and apparatus for using vertical magnetic stirring to produce turbulent and chaotic mixing in various states, without compromising components
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US7075040B2 (en) * 2003-08-21 2006-07-11 Barnstead/Thermolyne Corporation Stirring hot plate
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Also Published As

Publication number Publication date
JP3683301B2 (en) 2005-08-17
DE4406217A1 (en) 1995-09-07
ES2098860T3 (en) 1997-05-01
DE4406217C2 (en) 1997-04-17
EP0669160A1 (en) 1995-08-30
JPH07251055A (en) 1995-10-03
US5547280A (en) 1996-08-20
DE59402067D1 (en) 1997-04-17

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