EP0090165B1 - Laboratory agitator - Google Patents

Laboratory agitator Download PDF

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Publication number
EP0090165B1
EP0090165B1 EP83101464A EP83101464A EP0090165B1 EP 0090165 B1 EP0090165 B1 EP 0090165B1 EP 83101464 A EP83101464 A EP 83101464A EP 83101464 A EP83101464 A EP 83101464A EP 0090165 B1 EP0090165 B1 EP 0090165B1
Authority
EP
European Patent Office
Prior art keywords
eccentric
connector
agitator
cavity
metal
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
Application number
EP83101464A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0090165A1 (en
Inventor
Alberto Meda
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.)
Kartell SpA
Original Assignee
Kartell SpA
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.)
Filing date
Publication date
Application filed by Kartell SpA filed Critical Kartell SpA
Priority to AT83101464T priority Critical patent/ATE20832T1/de
Publication of EP0090165A1 publication Critical patent/EP0090165A1/en
Application granted granted Critical
Publication of EP0090165B1 publication Critical patent/EP0090165B1/en
Expired legal-status Critical Current

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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
    • B01F31/00—Mixers with shaking, oscillating, or vibrating mechanisms
    • B01F31/20—Mixing the contents of independent containers, e.g. test tubes

Definitions

  • This invention relates to a laboratory agitator for test tubes or small flasks, which is of improved operation over known agitators.
  • Laboratory agitators used at the present time comprise essentially the following parts:
  • Parts a, b, c are either mounted on a very heavy metal base provided with suckers for its fixing to the working surface, or are suspended in a very heavy metal casing which is also provided with suckers.
  • a very heavy metal base or casing is to absorb and damp the vibration, known agitators vibrate in all cases, disturbing the uniform agitation of the liquid contained in the test tube and communicating the vibration both to the operator and to the working surface.
  • Example of laboratory agitators having the features of the points a-d above mentioned are shown in FR-A-1.195.462, FR-A-2.480.619 and US-A-3.159.384.
  • a laboratory agitator has now been created, and forms the subject matter of the present invention, which is of new design and different from known agitators in each of its parts and overall, and is arranged to ensure effective uniform liquid agitation without vibrating.
  • the new agitator has a simple plastics casing which strongly reduces its weight and makes it much more economical to produce.
  • the reference numeral 1 indicates the rubber support into which the test tube is inserted under pressure
  • 2 indicates the metal insert.
  • the reference numeral 3 indicates the connector body 4, the plastics prong by which that part of the upper edge of the connector lying between two notches extends inwards, 5 the side arm into which the connector extends, and 6 the bore into which a self-tapping screw or similar piece can be inserted; 7 and 8 are two internal cylindrical cavities which together with the central frusto-conical part which connects them together constitute the housing for the eccentric; 10 is a metal plate embedded into the plastics part; 9 indicates the cavity of hexagonal cross section, wherein the metal insert 2 is inserted.
  • the reference numeral 11 indicates the central segment of the upper part of the eccentric, which is of frusto-conical cross-section slightly tapering upwards, and is inserted between two segments 12 and 13 of cylindrical cross-section.
  • the electric motor fixed to a base possibly provided with rubber feet for resting on the working surface, is connected to the shaft 24 inserted into the cavity 17 of the eccentric.
  • the counter-weight 23 is fitted to the shaft 24 either by screwing or by pressing through the bore 16.
  • this counter-weight is to eliminate system vibration and thus obviate one of the main drawbacks of known agitators by a completely new method.
  • the mass of the counter-weight is calculated for each apparatus according to the components concerned in the system, i.e. according to the rotating mass, the maximum rotational speed and the value of the eccentricity.
  • the counter-weight 23 is fitted on the opposite side of the eccentric axis to the motor axis.
  • the plastics connector 3 is mounted on the metal eccentric 10a mounted in this manner on the shaft 24.
  • the metal eccentric can rotate in a self-lubricated manner inside the connector, but cannot withdraw from it as it is retained by the plate or washer 22 which engages both with the connector arm 5 and with the projection provided for this purpose on the eccentric, and is fixed by a self-tapping screw 21 inserted into the bore 6 of the connector.
  • a metal stop pin 20 with a limited facility for vertical sliding is disposed in the cavity 15 of the eccentric.
  • the system comprising the stop pin 20, spring 19 and ball 18 ensures resilient movement of the connector along its vertical axis.
  • the metal plate 10 which prevents deformation and wear of the plastic material is embedded in that part of the connector opposing the metal ball.
  • the upper part of the plastics connector 3 is externally of cylindrical shape, whereas internally it comprises a cavity 9 of shape corresponding to that of the metal insert 2, and enabling this letter to the inserted under pressure.
  • the upper edge of the connector comprises two notches of approximately 1 cm in depth and such as to allow elastic deformation of the upper edge of the connector.
  • the part lying between the notches extends inwards to form two prongs 4 which engage in the conjugate groove provided in the metal insert 2, thus ensuring stable fixing of the test tube holder 1 to the agitator.
  • the metal insert is preferably faceted, in general in the form of a hexagonal nut.
  • the side arm 5 into which the lower part of the plastics connector 3 extends is grooved at its end part in order to receive a seat which allows the guide pin 25 for the arm sliding movement to be inserted.
  • the purpose of the arm-pin assembly is to act as a connecting rod for the movement of the eccentric.
  • the pin 25 is fixed to the bracket 26 which connects it to the base.
  • the end of the arm 5 also rests on a microswitch 27 which closes under pressure.
  • the connector 3 can move vertically in a resilient manner, so that when the test tube exerts pressure on the test tube holder (rubber support 1), the entire body is lowered and the arm 5 closes the microswitch 27, thus causing the agitator to operate for the duration of the pressure.
  • the microswitch can be disconnected and the agitator can operate by means of a normal manually operated switch independently of the pressure exerted by the test tube.
  • the new agitator can be used both for test tubes and for flasks.
  • the rubber part 1 is of a shape suitable in one case for holding a test tube and in the other case for retaining a flask, whereas the piece 2 (metal insert) is always identical.
  • the new agitator has the advantages over known agitators of being absolutely free from vibration, thus ensuring effective uniform agitation without drawbacks for the operator, of being of easier and more economical production in that many metal parts are replaced by plastics parts easily produced by moulding suitable thermoplastic resins, of being very easily disassembled and reassembled by anybody, and of being very easily modified to serve either for test tubes or flasks.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Devices For Use In Laboratory Experiments (AREA)
  • Mixers With Rotating Receptacles And Mixers With Vibration Mechanisms (AREA)
EP83101464A 1982-03-29 1983-02-16 Laboratory agitator Expired EP0090165B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT83101464T ATE20832T1 (de) 1982-03-29 1983-02-16 Laborruehrer.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT2044182 1982-03-29
IT20441/82A IT1151531B (it) 1982-03-29 1982-03-29 Agitatore da laboratorio

Publications (2)

Publication Number Publication Date
EP0090165A1 EP0090165A1 (en) 1983-10-05
EP0090165B1 true EP0090165B1 (en) 1986-07-23

Family

ID=11166987

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83101464A Expired EP0090165B1 (en) 1982-03-29 1983-02-16 Laboratory agitator

Country Status (4)

Country Link
EP (1) EP0090165B1 (it)
AT (1) ATE20832T1 (it)
DE (1) DE3364589D1 (it)
IT (1) IT1151531B (it)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9511334B2 (en) 2013-08-29 2016-12-06 Burrell Scientific LLC Clamp for a fluid container and method of use thereof

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2254280A1 (en) * 2009-05-19 2010-11-24 Electrolux Home Products Corporation N.V. Bus control for a domestic appliance

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1195462A (fr) * 1958-04-29 1959-11-17 Appareil à mouvement excentrique utilisable en particulier comme séparateur centrifuge ou comme agitateur
US3159384A (en) * 1962-07-02 1964-12-01 Bio Science Labor Agitator for laboratory tubes and flasks
DE1591961B2 (de) * 1967-09-27 1971-03-25 Licentia Patent Verwaltungs GmbH, 6000 Frankfurt Unterlager fuer elektrizitaetszaehler
DE3014551C2 (de) * 1980-04-16 1982-04-01 Janke & Kunkel & Co KG Ika - Werk, 7813 Staufen Schüttelvorrichtung

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9511334B2 (en) 2013-08-29 2016-12-06 Burrell Scientific LLC Clamp for a fluid container and method of use thereof

Also Published As

Publication number Publication date
DE3364589D1 (en) 1986-08-28
IT1151531B (it) 1986-12-24
ATE20832T1 (de) 1986-08-15
EP0090165A1 (en) 1983-10-05
IT8220441A0 (it) 1982-03-29

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