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Patent 2130858 Summary

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Claims and Abstract availability

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(12) Patent: (11) CA 2130858
(54) English Title: ORBITAL SHAKING ATTACHMENT
(54) French Title: ACCESSOIRE D'AGITATION ORBITAL
Status: Expired and beyond the Period of Reversal
Bibliographic Data
Abstracts

English Abstract


An orbital shaking attachment can be fitted or removed
from a magnetic stirrer thereby giving the stirrer the extra
function of orbital shaking in addition to its primary function
of magnetic stirring. The principal of he invention could also
be used to make a dedicated orbital shaker for other
applications such as in an over, incubator or liquid filled
tank. The orbital shaking attachment includes a top-plate/platform
with a circular magnet attached centrally to its
underside and a base-plate with a central circular hole. The
two plates are separated by ball bearings which are able to
roll around orbitally in bearing cups on both plates. When
operated the base-plate is static and the top-plate/platform
moves orbitally. The device is constructed mainly from
non-ferrous material except for the circular magnet and ball
bearings.


Claims

Note: Claims are shown in the official language in which they were submitted.


-5-
CLAIMS
1. An orbital shaking attachment comprising:
a top-plate/platform having a circular magnet attached to an underside surface
thereof, and
a plurality of first bearing cups also attached to said underside surface
adjacent the periphery thereof;
a base-plate including a plurality of second bearing cups attached to an upper
surface thereof;
each said first bearing cup being vertically aligned with a corresponding
second bearing cup,
each pair of vertically aligned first and second bearing cups accommodating
therebetween a loose
fitting ball bearing, said ball bearings separating said top-plate/platform
vertically from said base-plate
and allowing said top-plate/platform to move in a discrete orbital motion when
said circular magnet
is magnetically coupled to a rotating magnet of a magnetic stirrer.
2. An orbital shaking attachment as defined in claim 1 wherein said base-plate
is provided with
a central hole suitably sized to accommodate the travel of said circular
magnet, thus allowing said
circular magnet to be as close as possible to the rotating magnet of such
magnetic stirrer.
3. An orbital shaking attachment as defined in claim 1 or claim 2 wherein said
base-plate includes
means for securing said base-plate to an operating platform of a magnetic
stirrer whereby said
base-plate remains stationary when said attachment is operated.

Description

Note: Descriptions are shown in the official language in which they were submitted.


.. ~ ~ ~~~o~~~
File No. C9418
ORBITAL SHAKING ATTACHMENT
BACKGROUND OF THE INVENTION
This invention relates to a magnetically coupled and
driven orbital shaking attachment.
Orbital shakers are well known devices comprising a flat
table or platform which is moved in a circular gyratory motion,
usually by an electric motor. Flasks containing liquid are
placed on the table and its orbital motion acts on the liquid
in the flask to give a swirling, shaking movement to stir and
mix the liquid.
These machines are relatively expensive and are generally
exclusive for the one function.
SUN~IARY OF THE INVENTION
The present invention consists of a magnetically coupled
and driven table which is used as an attachment to another
device, namely a magnetic stirrer. Magnetic stirrers comprise
an electric motor with a magnet fixed horizontally to one end
of the motor shaft. The rotating magnet is placed in close
proximity to the base of a flask of liquid in which there is a
magnetic bar. The magnetic bar will follow the motion of the
driven magnet and provide a stirring action to the.liquid. The
driven magnet on a magnetic stirrer is a form of power which
can be magnetically coupled to the present invention thereby
giving the dual function of magnetic stirring or orbital
shaking to a magnetic stirrer. Moreover, if the magnetic
stirrer incorporates a heater, then this function can also be
used on the orbital shaking device. The present invention
could also be placed on the bottom of a tank of liquid with the
magnetic coupling being made by a rotating magnet mounted in

CA 02130858 2000-02-25
-2-
close proximity to the outside of the base of the tank. The
principal of this invention could also be applied to make a
dedicated orbital shaking machine that could be used within an
oven, incubator, flameproof area or any other vessel or tank where,
for example, the use of electrical equipment would be a hazard and
by using the same type of rotating magnetic coupling on the outside
of such a container as the means of propulsion.
According to the present invention, there is provided an
orbital shaking attachment comprising a top-plate/platform having
a circular magnet attached to an underside surface thereof, and a
plurality of first bearing cups also attached to the underside
surface adjacent the periphery thereof; a base-plate including a
plurality of second bearing cups attached to an upper surface
thereof; each first bearing cup being vertically aligned with a
corresponding second bearing cup, each pair of vertically aligned
first and second bearing cups accommodating therebetween a loose
fitting ball bearing, the ball bearings separating the
top-plate/platform vertically from the base-plate and allowing the
top-plate/platform to move in a discrete orbital motion when the
circular magnet is magnetically coupled to a rotating magnet of a
magnetic stirrer.
Preferably, the invention uses eight bearing cups, one
fitted to each corner of the two plates and in exact relative
alignment, and four ball bearings sized to roll around the cups
freely, to provide the circular orbital motion to the
top-plate/platform. The number and arrangement of ball bearings
and cups may be varied from this basic design to accommodate
different dimensions or load capacities. A means of attachment to
a magnetic stirrer will keep the base-plate stationary and allow
the top-plate/platform to travel in a discrete orbital motion when
the magnetic stirrer is operated. The device must be constructed
mainly from non-ferrous material such as aluminum with the
exception of the circular magnet attached to the top-plate/platform
and possibly the ball bearings.

CA 02130858 2000-02-25
-2A-
BRIEF DESCRIPTION OF THE DRAWINGS
Figure 1 shows a side view of the orbital shaking
attachment fixed on a simple schematic representation of a magnetic
stirrer showing the internal arrangement of the moving

File No. C9418
-3-
magnet on the magnetic stirrer.
Figure 2 shows an exploded diagram of the orbital shaking
attachment in perspective, showing the constituent parts of the
device looking from below.
DETAILED DESCRIPTION OF THE INVENTION
Referring to the drawing, the orbital shaking attachment
comprises a base-plate 5 with four ball bearing cups 3, and a
central hole 10, sized to accommodate the travel of the
circular magnet 2 attached to the top-plate/platform 1.
Figures 1 and 2 show a means of securing the base-plate 5 to
different sizes of magnetic stirrers using adjustable eccentric
cams 6, but other means may be used such as straps, brackets,
screws, designed to fit a particular magnetic stirrer or
similar means (not shown). A top-plate/platform 1 with four
bearing cups 3 positioned in exact alignment with the bearing
cups on the base-plate, a circular magnet 2 attached to the
central underside of the top-plate/platform and four suitably
sized ball bearings 4 to fit between top-plate/platform 1 and
base-plate 5 and running loosely in the bearing cups 3 to allow
an orbital motion.
In order to operate the shaker, the base-plate 5 is
suitably positioned and secured on the magnetic stirrer
operating platform as in Figure 1. The four ball bearings 4
are placed into the base-plate bearing cups 3 and the top-
plate/platform 1 lowered onto the ball bearings 4, lining up
the bearing cups on the top and base-plates. When the magnetic
stirrer 9 is operated the magnet 7 turns and couples to the
circular magnet 2 on the top-plate/platform 1 and allows it to

File No. C9418
-4-
move in an orbital motion as determined by the ball bearings 4
running in the bearing cups 3. To dismount the orbital shaker
from the magnetic stirrer the above steps are carried out in
reverse order.

Representative Drawing
A single figure which represents the drawing illustrating the invention.
Administrative Status

2024-08-01:As part of the Next Generation Patents (NGP) transition, the Canadian Patents Database (CPD) now contains a more detailed Event History, which replicates the Event Log of our new back-office solution.

Please note that "Inactive:" events refers to events no longer in use in our new back-office solution.

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Event History

Description Date
Inactive: IPC expired 2022-01-01
Inactive: IPC expired 2022-01-01
Time Limit for Reversal Expired 2007-08-27
Letter Sent 2006-08-25
Grant by Issuance 2000-10-31
Inactive: Cover page published 2000-10-30
Pre-grant 2000-06-12
Inactive: Final fee received 2000-06-12
Notice of Allowance is Issued 2000-05-04
Notice of Allowance is Issued 2000-05-04
Letter Sent 2000-05-04
Inactive: Approved for allowance (AFA) 2000-04-20
Amendment Received - Voluntary Amendment 2000-02-25
Inactive: S.30(2) Rules - Examiner requisition 1999-08-30
Amendment Received - Voluntary Amendment 1997-07-30
Letter Sent 1997-06-27
Inactive: Application prosecuted on TS as of Log entry date 1997-06-25
Inactive: Status info is complete as of Log entry date 1997-06-25
Request for Examination Requirements Determined Compliant 1997-06-04
All Requirements for Examination Determined Compliant 1997-06-04
Application Published (Open to Public Inspection) 1996-02-26

Abandonment History

There is no abandonment history.

Maintenance Fee

The last payment was received on 2000-08-17

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  • the reinstatement fee;
  • the late payment fee; or
  • additional fee to reverse deemed expiry.

Please refer to the CIPO Patent Fees web page to see all current fee amounts.

Fee History

Fee Type Anniversary Year Due Date Paid Date
MF (application, 3rd anniv.) - standard 03 1997-08-25 1997-06-02
Request for examination - standard 1997-06-04
MF (application, 4th anniv.) - standard 04 1998-08-25 1998-06-11
MF (application, 5th anniv.) - standard 05 1999-08-25 1999-06-16
Final fee - standard 2000-06-12
MF (application, 6th anniv.) - standard 06 2000-08-25 2000-08-17
MF (patent, 7th anniv.) - standard 2001-08-27 2001-08-10
MF (patent, 8th anniv.) - standard 2002-08-26 2002-08-02
MF (patent, 9th anniv.) - standard 2003-08-25 2003-08-01
MF (patent, 10th anniv.) - standard 2004-08-25 2004-05-11
MF (patent, 11th anniv.) - standard 2005-08-25 2005-07-29
Owners on Record

Note: Records showing the ownership history in alphabetical order.

Current Owners on Record
DAVID JOHN FLETCHER
Past Owners on Record
None
Past Owners that do not appear in the "Owners on Record" listing will appear in other documentation within the application.
Documents

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Document
Description 
Date
(yyyy-mm-dd) 
Number of pages   Size of Image (KB) 
Cover Page 1996-04-16 1 14
Description 1996-02-26 4 140
Abstract 1996-02-26 1 30
Claims 1996-02-26 1 35
Drawings 1996-02-26 1 25
Cover Page 1996-04-17 1 14
Abstract 1996-04-17 1 30
Description 1996-02-26 4 140
Claims 1996-04-17 1 35
Drawings 1996-04-17 1 25
Description 1996-04-17 4 140
Claims 1996-02-26 1 35
Drawings 1996-02-26 1 25
Cover Page 1996-04-16 1 14
Abstract 1996-02-26 1 30
Representative drawing 2000-10-05 1 6
Representative drawing 1997-09-30 1 5
Cover Page 2000-10-05 1 33
Description 2000-02-25 5 160
Claims 2000-02-25 1 36
Acknowledgement of Request for Examination 1997-06-27 1 178
Commissioner's Notice - Application Found Allowable 2000-05-04 1 164
Maintenance Fee Notice 2006-10-23 1 173
Correspondence 2000-06-12 1 28
Fees 1996-06-11 1 55