EP2492005A1 - Dispositif antichute pour barreaux magnétiques - Google Patents

Dispositif antichute pour barreaux magnétiques Download PDF

Info

Publication number: EP2492005A1
Authority: EP; European Patent Office
Prior art keywords: magnetic; catching; section; magnetic stirring; stirring rod
Prior art date: 2011-02-25
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.): Granted

Application number

EP12001283A

Other languages

German (de)

English (en)

Other versions

EP2492005B1 (fr

Inventor

Markus Herbert Zeiler

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.)

Individual

Original Assignee

Individual

Priority date (The priority date 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 date listed.)

2011-02-25

Filing date

2012-02-27

Publication date

2012-08-29

2012-02-27 Application filed by Individual filed Critical Individual

2012-08-29 Publication of EP2492005A1 publication Critical patent/EP2492005A1/fr

2014-07-16 Application granted granted Critical

2014-07-16 Publication of EP2492005B1 publication Critical patent/EP2492005B1/fr

Status Not-in-force legal-status Critical Current

2032-02-27 Anticipated expiration legal-status Critical

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Classifications

- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/45—Magnetic mixers; Mixers with magnetically driven stirrers
- B01F33/452—Magnetic mixers; Mixers with magnetically driven stirrers using independent floating stirring elements
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
- B01F2101/23—Mixing of laboratory samples e.g. in preparation of analysing or testing properties of materials

Definitions

the present invention relates generally to magnetic safety devices, and more particularly to a magnetic magnetic stirring device.
magnetic stirrers which rotate a magnetic stirrer by means of a rotating magnetic field.
the magnetic stirring bar is typically located in a container which stands on the magnetic stirrer.
the rotating magnetic field causes the magnetic stir bar to rotate and thereby mixes a liquid in the container.
the object of the present invention is to provide a safety device that catches the magnetic stirring rod before it enters the spout.
the present invention provides a magnetic stir bar catcher.
the safety device comprises a magnetic catching section which is designed to generate a magnetic field and at least one spacer element which is arranged at least partially below the catching section.
the at least one spacer extends away from the magnetic capture portion such that a space is formed below the magnetic capture portion through which a liquid can flow with a magnetic stir bar, the magnetic field strength (magnetic field strength) of the magnetic field generated by the magnetic capture portion being adapted thereto Magnetically attract the magnetic stirring bar from the liquid against gravity and magnetically hold on the magnetic catching section.
Fig. 1 illustrates an embodiment of a magnetic catcher 1 for magnetic stirring.
Some magnetic stirrers in particular very small (a few millimeters in size) with very low weight, for example about 0.1 g, can also be significantly more expensive, e.g. up to 20 euros.
the inventor has now recognized that it is possible by a simple and inexpensive solution to catch a magnetic stir bar before it enters the spout by being magnetically attracted and magnetically held by means of a magnetic catch arranged over the spout.
the magnetic stirring device catching device has a magnetic catching section which is designed to generate a magnetic field.
the magnetic safety gear on at least one spacer element which is at least partially disposed below the magnetic catching portion.
the spacing element is designed to hold the magnetic catching device or the magnetic catching section at a specific distance from the spout. The distance between the spout and the magnetic catching section or the magnetic safety device forms a passage for liquid to be poured into the spout on which the safety gear is arranged.
the at least one spacer element extends away from the magnetic catching section in such a way that a space is created below the magnetic catching section, through which a liquid can flow with a magnetic stirring bar.
liquid can flow from outside the safety gear below the catching section and the at least one or more spacer elements, so that they into the spout passes, which is arranged below the catching section.
the liquid with the magnetic stirrer to be stopped thus flows from outside the catching device past the at least one spacer element and below the magnetic catching section through the space into the spout.
the magnetic field strength (magnetic field strength) of the magnetic field generated by the magnetic catching portion is adapted to magnetically attract the magnetic stir bar against gravity from the liquid flowing into the spout through the space below the magnetic catch portion and magnetically hold it at the bottom of the magnetic catch portion.
the magnetic field strength of the magnetic field generated by the magnetic capture device or its capture section is adapted to a particular type of magnetic stir bars, while in other embodiments, the magnetic field strength is so high that all commercially available magnetic stir bars, typically weighing less than one gram, For example, down to 0.1 g, or a few grams, for example 1-2 grams, or up to a maximum of 50 grams, can be attracted and held by the magnetic capture section.
Some magnetic stirring bars can also have a higher weight, for example. 100 grams and in some embodiments, such heavy magnetic stirring bars can be attracted by the magnetic field, lifted and held.
the present invention is not limited to the weight and dimensions of particular magnetic stirring bars. The weights and dimensions given in the description serve only to illustrate the present invention.
the magnetic safety device is adapted to certain Magnetic stir bars with certain external dimensions and a certain weight.
typical magnetic stir bars of, for example, cylindrical shape and having a length of 6 mm, a diameter of 3 mm and a weight of 1 gram to a length of 80 mm, a diameter of 10 mm and a weight of 50 grams be captured and detained. Magnetic stirring bars that are longer than 80 mm typically no longer fall through the spout.
very small magnetic stirring bars which have only an extension in the millimeter range and a weight of less than one gram, are lifted and held by the magnetic field.
magnetic stir bars may be rod-shaped, i. be cylindrical; but they may also have another shape, as known in the art, such as cylindrical with ring, triangular, egg-shaped, tablet-shaped, spherical, cylindrical with conically tapered ends, dumbbell-shaped, square, tandem, etc.
the at least one spacer element has at least one support portion adapted to be placed on a spout portion of a spout of a spout and has a restriction portion adapted to at least partially project into the spout.
the distance between the lower portion of the magnetic catching portion and a pouring basin bottom on which the support portion rests is determined by the spacing member.
the required magnetic field strength for attracting and holding a particular Magnetic stir bars is set, as the expert is aware of how the magnetic field behaves with increasing distance from the magnetic capture section away and decreases.
the magnetic safety device can not slip when placed on the spout, as the boundary sections of the spacer project into the spout and abut the inner and inner walls of the spout, thus preventing sideways movement.
the support portion of the at least one spacer and the restriction portion form a substantially perpendicular angle to each other.
the drainpipe and the spout portion ie, the edge of the drainpipe, also form a substantially right angle, so that in such embodiments, the magnetic catcher can be accurately placed on or in the spout.
the support region lies substantially entirely on the spout section and possibly also on the region of the spout surrounding the spout section and the boundary section or abutment against the inner wall of the spout, so that the boundary section and the support section enclose the right angle between spout and spout section.
a spacer element has a plurality of support sections and delimiting sections, which are formed, for example, by a stepped step on the spacer element.
the least one spacer element is arranged to be movable in the magnetic catching section also in a lateral direction.
the lateral direction is, for example, essentially parallel to the pouring basin surface when the magnetic catching device is mounted, or in some embodiments parallel to the longitudinal direction of the magnetic catching section.
At least two spacer elements are present, which are laterally movable such that the distance between the spacer elements can be changed.
the spacer elements for example, are arranged opposite each other.
the spacer element has a guide section, which engages in a guide rail, which is arranged in the magnetic catching section.
the movable spacer elements can be held at predetermined positions by locking elements, which are arranged, for example, in the guide rail.
locking elements which are arranged, for example, in the guide rail.
the mobility of the spacers is reduced by a rough surface in the guide rail and / or on the guide portion, so that the spacers remain in a specific position and not easily slip.
the magnetic field for trapping magnetic stirring bars is generated in some embodiments of a permanent magnet and / or electromagnet, which is arranged in a receiving region of the magnetic catching portion and is set up for receiving the magnetic field generating element.
the magnetic safety device is used in particular in laboratory operation, where the liquids are partially highly corrosive. Accordingly, in some embodiments, the surface is at least partially, especially in the areas that may come into contact with liquid, an acid-resistant material.
the acid-resistant material comprises at least one of the following materials: glass, precious metal, stainless steel, chromium, aluminum, titanium, lead, zinc, polytetrafluoroethylene, and plastic with polyhalogenated hydrocarbons, granite, gneiss, porphyry, etc.
the entire safety gear is made of an acid-resistant material, for example, one of the above-mentioned.
the magnetic catching device 1 has a disk-shaped and magnetic catching section 2.
the magnetic catching section 2 has in the middle a receptacle 4 in which a permanent magnet is embedded.
three identical spacers 3 extend in a star shape away from the center of the catching section 2 to the outside. The three spacers 3 each form an angle of 120 ° to each other.
the magnetic safety device 1 is completely made of acid-resistant plastic and thus easy and inexpensive, for example. In the injection molding process.
each of the three spacers 3 has a support portion 8 and a limiting portion 6, which occupy a right angle to each other.
each of the three spacers 3 at the top has a guide portion 7 which protrudes laterally and extends over the entire length of the spacer 3.
the spacer 3 has characterized at the top of a T-shaped profile (s. Fig. 4 ).
the catching section 2 has for each spacer 3 a rail 5, in each one Guide portion 7 of a spacer 3 engages.
the rails 5 each extend from the center, ie the receptacle 4, of the catching section 2 at an angle of 120 ° to each other outwards.
the spacers 3 with the respective guide section 7 are designed to be shorter overall than the rail 5 and can consequently be moved back and forth in the rail 5. In order to prevent falling out of the spacers 3 on the outer edge of the rails 5, the rails 5 are blocked at the respective outer and inner ends.
the spacers 3 are displaceable, they can be adapted to different diameters of spout pipes and the limiting sections 6 can each be pushed so far outward until they hit the inner walls of a spout. This ensures a secure hold of the safety gear 1 in a spout.
Fig. 6 the magnetic safety device 1 is shown mounted on a spout 11 of a sink base 12.
the spacers 3 are adjusted so that the respective boundary sections 6 abut against the inner wall of the spout 11 (or of the spout).
the respective support portions 8 of the spacers 3 rest on an upper spout portion 14 of the spout 11 and on a portion of the spout basin bottom 12 which surrounds the spout 11.
a liquid 10 is then poured into the pouring basin with a magnetic stirring bar 13, the liquid 10 flows together with the magnetic stirring bar 13 on the pouring basin bottom 12 as far as the pouring spout 11.
the magnetic stirring bar 13 assumes different positions, two of which are in Fig. 6 are identified as 13a and 13b.
the liquid 10 flows together with the magnetic stirring bar to the magnetic safety device 1 (position 13a of the magnetic stirring) and flows under the magnetic catching section 2 and between two spacers 3 into the space 9 below the catching section 2 (position 13b of the magnetic stirring bar).
the magnetic attraction of the permanent magnet in the receptacle 4 of the catching section 2 acts on the magnetic stirring bar 13 and pulls the magnetic stirring bar 13 against the force of gravity and holds it in the region of the receptacle 4 on the underside of the catching section 2, while the liquid 10 flows into the spout 11. Accordingly, the magnetic field of the magnetic catching section separates the magnetic stirring bar 13 from the liquid 10 in the space 9 before it reaches the spout 11. This reliably prevents the magnetic stirrer 13 itself from being flushed into the spout 11 by the liquid 10.
the distance between the underside of the magnetic catching section 2 and the spout 11 or the pouring basin bottom 12 is defined by the spacers 3 and extends from the underside of the magnetic catching section 2 to the support sections 8 of the spacers 3.
the magnetic field generated by the permanent magnet arranged in the receiving area 4 is so strong that it can attract the magnetic stirring bar 13 against the flow of the liquid 10 and against gravity and can hold it on the underside of the catching section 2.
the spacers 3 are displaceable and thereby adaptable to spouts of different diameters.
the spacers are eg: fixedly attached to the catching portion 2 or formed integrally therewith.
a magnetic safety device 1 ' which is otherwise equal to the safety gear 1 of the embodiment described above, three spacers 3' with a plurality of stepped gradations, each forming a support portion 8a-d and a limiting portion 6a-d.
the staircase-like gradations are designed such that the distance between opposing boundary sections 6a-d changes depending on the step.
the distance between the underside of the catching portion 2 and the support portion 8a-d varies depending on the step.
the staircase-like gradation is designed such that the distance of opposing boundary surfaces 6d is smallest, when the distance between the underside of the catching section 2 and the associated support section 8d is the greatest and vice versa. That is, the distance between the bottom of the catching portion 2 and the support portion 8a on the uppermost step is smallest when the distance between opposite boundary sections 6a is greatest.
the magnetic safety gear 1 ' can be fitted on suitable nozzles with different diameters.
the distance between the bottom of the catch portion 2 and the support portion 8a-d which rests on the spout basin bottom, depends on which support portion 8a-d rests the safety gear.
the magnetic stirring 13 has, for example, a length of 10 mm and a diameter of 3 mm, and a weight of 1 gram.
the magnetic stirring bars 13 may have other dimensions and weight and the present invention is not limited to this embodiment.
the magnetic catching portion 2 is disc-shaped, so that it can be easily taken by a user in the hand and the captured magnetic stirring can be easily removed.
the magnetic catch portion has any shape, such as rectangular, triangular, star-shaped, oval, etc.
the magnetic catch portion 2 may be made of a magnetic material, so that the receptacle 4 is omitted.
the present invention is not limited to any particular number or shape of spacers.
the spacing element (s) perform the function of creating a passage for a liquid with a magnetic stir bar below the catching section and preventing it from slipping off the spout.

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Chemical & Material Sciences (AREA)
Chemical Kinetics & Catalysis (AREA)
Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)

EP12001283.6A 2011-02-25 2012-02-27 Dispositif antichute pour barreaux magnétiques Not-in-force EP2492005B1 (fr)

Applications Claiming Priority (1)

Application Number	Priority Date	Filing Date	Title
DE102011012404A DE102011012404A1 (de)	2011-02-25	2011-02-25	Fangvorrichtung für Magnetrührstäbchen

Publications (2)

Publication Number	Publication Date
EP2492005A1 true EP2492005A1 (fr)	2012-08-29
EP2492005B1 EP2492005B1 (fr)	2014-07-16

Family

ID=45811246

Family Applications (1)

Application Number	Title	Priority Date	Filing Date
EP12001283.6A Not-in-force EP2492005B1 (fr)	2011-02-25	2012-02-27	Dispositif antichute pour barreaux magnétiques

Country Status (2)

Country	Link
EP (1)	EP2492005B1 (fr)
DE (1)	DE102011012404A1 (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
EP0676631A1 (fr) *	1994-03-22	1995-10-11	Senju Seiyaku Kabushiki Kaisha	Appareil pour examiner la perméabilité de la cornée
US5586823A (en) *	1993-02-17	1996-12-24	Unipath Limited	Magnetic stirring system
DE10025381A1 (de) *	2000-05-24	2001-12-06	Britta Kurzer	Vorrichtung und Verfahren zum Lösen eines Gases in einer Flüssigkeit, insbesondere Sauerstoff in Wasser
US6337024B1 (en) *	1999-07-13	2002-01-08	Hammonds Technical Services, Inc.	Chlorination apparatus and method

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US7900289B2 (en) *	2007-08-23	2011-03-08	Bel-Art Products	Magnetic sink strainer

2011
- 2011-02-25 DE DE102011012404A patent/DE102011012404A1/de not_active Withdrawn
2012
- 2012-02-27 EP EP12001283.6A patent/EP2492005B1/fr not_active Not-in-force

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number	Priority date	Publication date	Assignee	Title
US5586823A (en) *	1993-02-17	1996-12-24	Unipath Limited	Magnetic stirring system
EP0676631A1 (fr) *	1994-03-22	1995-10-11	Senju Seiyaku Kabushiki Kaisha	Appareil pour examiner la perméabilité de la cornée
US6337024B1 (en) *	1999-07-13	2002-01-08	Hammonds Technical Services, Inc.	Chlorination apparatus and method
DE10025381A1 (de) *	2000-05-24	2001-12-06	Britta Kurzer	Vorrichtung und Verfahren zum Lösen eines Gases in einer Flüssigkeit, insbesondere Sauerstoff in Wasser

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
REISS LABORBEDARF E.K., 55120 MAINZ-MOMBACH [DE]: "online-Laborkatalog 2012, Kategorie Magnetrührstäbchen-Rückhalter", Internet, XP002677143, Retrieved from the Internet <URL:http://www.reiss-laborbedarf.de/?seite=shop&shop_unterseite=artikeldetail&navi_shop=15&artgr_nr=58&artikel_id=971848> [retrieved on 20120605] *

Also Published As

Publication number	Publication date
DE102011012404A1 (de)	2012-08-30
EP2492005B1 (fr)	2014-07-16

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