Shaking table having direct electromagnet drive

Details Shaking table having direct electromagnet drive Shaking table having direct electromagnet drive

1992-04-14

1993-11-09

Hornsby, Harvey C.

Agitating

By vibration

Of platform or mixing chamber supported by vibrator

366116, 366127, 366208, 335219, 335285, 335289, B01F 1100

Patent

active

052596729

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

This invention relates to shaking tables such as are used in laboratories to agitate liquid in flasks.
Such tables conventionally comprise a motor driving a cam, crank or eccentric, which acts on the table top, and are subject to the usual requirements for prolonged satisfactory operational life of such "moving part" mechanical components, which means they are expensively constructed and/or require frequent maintenance and repair. They are also not very controllable.


DISCLOSURE OF THE INVENTION

The present invention provides a shaking table which does not have these disadvantages.
The invention comprises a shaking table having a direct electromagnetic drive, characterised by comprising a base mounting electromagnet coil means and armature means moved by said coil means and connected to a table top, supported on the base by flexible post means.
The table top may be a snap fit on the armature.
The table may have separate electromagnet means for effecting movement in different directions, and may have two opposed pairs of electromagnet means arranged orthogonally.
The table may comprise drive means pulse-energizing said electromagnet coil means.
Control means for the drive means may be adapted to control pulse frequency and/or amplitude, and may also alter the energizing pulse pattern whereby to produce different shaking modes.


BRIEF DESCRIPTION OF THE DRAWINGS

Embodiments of shaking tables according to the invention will now be described with reference to the accompanying drawings, in which:
FIG. 1 is a plan view of one embodiment,
FIG. 2 is a partly sectional elevation of the embodiment of FIG. 1,
FIG. 3 is a front elevational view of the embodiment of FIG. 1, and
FIG. 4 is a diagrammatic illustration of a driving and controlling arrangement.


BEST MODE OF CARRYING OUT THE INVENTION

The drawings illustrate a shaking table having direct electromagnet drive members 12. The table 11 has a bi-directional shaking motion, that is to say, regarding one edge 11a of the table 11 as an x-axis and an adjacent edge 11b as a y-axis, shaking movement of the table top 13 takes place in both x- and y-directions.
The table 11 has separate electromagnet means 14a, 14b, 15a, 15b effecting movement in different directions. Each separate electromagnetic means comprises an opposed pair 14a, 14b; 15a, 15b of electromagnets, the pairs being arranged orthogonally to each other. The pairs 14a, 14b or 15a, 15b are arranged diagonally on the table 11.
An articulating mechanism 16 includes connecting links 16b which are respectively connected to a hub 16a by pairs of snap fitting joints 18. The hub 16a is then attached to the table top 13.
Flour flexible corner posts 22 stand up from the table 11 and project slightly above the main housing 23 thereof. The top 13 locates on the upper ends of the posts when it is engaged on the mechanism 16, so that movements of the mechanism 16 are reflected in movements of the table top 13 on the flexible posts 22.
It will now be seen that energizing either magnet of the pair 14a, 14b will move the table top 13 along the diagonal towards that magnet, and likewise for the other magnet pair 15a, 15b. The hub 16a is articulated by having connecting links 16b pivotally connected to the hub 16a to allow such movement.
It will now be seen at once that sequentially switching the magnets 14a, 15a, 14b, 15b will effect a corresponding movement of the table top.
The snap fit of the top 13 to the hub 16a enables it to be removed for cleaning and for servicing access to the housing 23.
The driving and controlling arrangement illustrated in FIG. 4 is very much like a stepper motor drive arrangement and comprises a sequencing logic circuit 41 driving the electromagnets 14a, 15a, 14b, 15b sequentially. An amplitude control 42, which might be a decade switch, controls the pulse current through each magnet, and a frequency control 43, which might also be a decade switch, controls the frequency with which the circuit 41 sequences through the switching cycle. A manual on/off 44 is provided in par

REFERENCES:
patent: 1739349 (1929-12-01), Blain
patent: 1945015 (1934-01-01), Wurzbach et al.
patent: 4061315 (1977-12-01), Eitzen et al.
patent: 4118801 (1978-10-01), Kraft et al.
patent: 4202634 (1980-05-01), Kraft et al.
patent: 4305668 (1981-12-01), Bilbrey
patent: 4750845 (1988-06-01), Nabetani
patent: 5060151 (1991-10-01), Mikyska et al.

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