1. Field of the Invention
This invention relates generally to an apparatus for mixing fluids held in laboratory vessels, such as test tubes and, more particularly, to a vortexer capable of agitating by electromagnetic means.
2. Description of Related Art
Vortex mixers (often referred to as vortexers) used to mix liquids in a laboratory environment are well known in the art. Prior art vortexers typically carry out mixing operations on one or a plurality of containers, such as test tubes, beakers and flasks. These vortexers are generally described in U.S. Pat. No. 4,305,668.
With reference to
The typical prior art vortexer, which generally has a significant number of components, such as joints, bearings and an electrical motor, is relatively expensive, noisy and produces a substantial amount of vibration. Although attempts have been made to dampen some of the noise and vibration in these prior art vortexers, such as providing the base with rubber suction cup feet, the vibration and the noise cannot be significantly reduced because of the number of moving parts and the inherent vibration caused by the motor and eccentric crank and coupling design. Therefore, it would be desirable to overcome the above-mentioned deficiencies by providing an electromagnetic vortexer having minimal vibration and a minimum number of moving parts.
The present invention is a vortexer that includes an enclosure, an upwardly extending shaft in the enclosure, a plurality of electromagnets arranged around the shaft, a holder pivotably supported by the shaft and spaced above the electromagnets, a power source, and a device in communication with the electromagnets and the power source for selectively activating each electromagnet with power from the power source, whereupon the holder pivots or wobbles with respect to the enclosure.
a is a sectional view taken along lines III-III in
b is an isolated view of detail A in
With reference to
Vortexer 20 includes an enclosure 22 having a lower surface 24, an upper surface 26 and sides that define an interior cavity 28. As shown best in
A plurality of electromagnets 36, for example, without limitation, four electromagnets 36, having a top surfaces 38 is circumferentially arranged around fastener 34 and opening 30 of cavity 28.
Cavity 28 can include separate compartments 29, each of which is configured to receive an electromagnet 36, thus separating electromagnets 36 from each other. Enclosure 22 can also include a plurality of fasteners 31, each of which extends into a corresponding compartment 29. Each fastener 31 is threadedly mated within a threaded opening 37 of an electromagnet 36 positioned in the corresponding compartment 29 for securing the electromagnet 36 therein.
As shown best in
Sample holder 40 is pivotably supported on upper surface 33a of lip 32 (in a manner described hereinafter) in spaced relation to electromagnets 36. Body 42 has a first or upper side 46 and includes a peripheral lip 50 extending from peripheral edge 44. Lip 50 extends laterally, desirably perpendicularly, away from second side 48 of body 42.
First side 46 of body 42 includes a cylindrical member 52 that is either attached thereto or formed integrally therewith and which is spaced from peripheral edge 44. Cylindrical member 52 extends laterally, desirably perpendicularly, away from first side 46 of body 42 and includes therein a bore 54 configured to receive and hold a laboratory container (not shown), such as a test tube. Cylindrical member 52 and/or bore 54 can be any desirable size or shape.
Second side 48 of body 42 includes a cylindrical protrusion 56 that is either attached thereto or formed integrally therewith and which is spaced from peripheral edge 44 and extends laterally, desirably perpendicularly, away from second side 48 of body 42. An exterior of protrusion 56 includes a shoulder 64 having a surface 66 positioned facing upper surface 33a of ring-shaped lip 32. Protrusion 56 includes a bore 58 therein for receiving the threaded end of fastener 34. Bore 58 can have internal threads for threadly mating the threaded end of fastener 34 to protrusion 56, whereupon body 42 is pivotably supported on lip 32.
Vortexer 20 includes one or a stack of elastic washers 70 or bearings (shown best in
As shown best in
With reference to
As shown in
In operation, electromagnets 36 are selectively activated in a predetermined sequence, such that body 42 is magnetically drawn toward the surface 38 of each activated electromagnet 36, whereupon a portion of lip 50 contacts ring 74. As each electromagnet 36 in the sequence is activated, either alone or at the same time as the immediately preceeding electromagnet 36 in the sequence, body 42 tilts toward said electromagnet 36, whereupon another portion of lip 50 contacts ring 74. The activation and deactivation of electromagnets 36 can be done in a rotational sequence such that consecutive portions of lip 50 sequentially contact ring 74, thus causing holder 40 and, more particularly, cylindrical member 52 to rotate pivotally or wobble circularly.
It should be understood that the embodiments described herein are for illustrative purposes only and that various modifications or changes in light thereof will be suggested to persons skilled in the art and are to be included within the spirit and purview of this application.
This application claims the benefit of U.S. Provisional Patent Application Ser. No. 60/545,159, filed Feb. 17, 2004, which is hereby incorporated by reference in its entirety.
Number | Date | Country | |
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60545159 | Feb 2004 | US |