Card – picture – or sign exhibiting – Display device with gas or liquid movement
Reexamination Certificate
1999-09-21
2001-10-02
Davis, Cassandra H. (Department: 3628)
Card, picture, or sign exhibiting
Display device with gas or liquid movement
C446S136000
Reexamination Certificate
active
06295749
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to an ornamental display toy, and more particularly to such an ornamental display toy, which uses a motor drive to rotate a magnetic stirrer on its own axis in a chemical liquid inside a transparent container, and to revolve the magnetic stirrer around the longitudinal central axis of the container, causing a variable whirlpool to be produced in the chemical liquid in the container.
FIG. 1
shows an ornamental display toy according to the prior art. This structure of ornamental display toy comprises a transparent container holding two liquids of different specific gravity, a centrifugal vane wheel mounted in the container, and a partition board provided inside the container above the vane wheel. The partition board has a suction hole aimed at the vane wheel, and a plurality of exhaust holes around the border. When the vane wheel is rotated, the liquid of smaller specific gravity is spirally drawn downwards, causing a tornado to be produced in the container. Because the vane wheel is fixedly mounted inside the container at the bottom, it can cause only one fixed pattern of whirlpool. When changing the revolving speed of the vane wheel, the size of the whirlpool is relatively changed, however the pattern of the whirlpool remains unchanged.
SUMMARY OF THE INVENTION
It is the main object of the present invention to provide an ornamental display toy, which uses a simple mechanical design to achieve a variable whirlpool effect.
According to one aspect of the present invention, the ornamental display toy comprises a transparent container supported on a base and filled with a chemical liquid, a magnetic stirrer mounted in the container and driven to stir up the liquid, a motor drive formed of a motor and a transmission mechanism and controlled by a control circuit to turn the magnetic stirrer on its own axis and to revolve the magnetic stirrer around the longitudinal central axis of the container, causing a variable whirlpool to be produced in the liquid inside the container.
According to another aspect of the present invention, the transmission mechanism can be a gear transmission mechanism, friction transmission mechanism, or belt transmission mechanism.
REFERENCES:
patent: 4490931 (1985-01-01), Fleemin
patent: 5018288 (1991-05-01), Yang
patent: 5272604 (1993-12-01), Lin
patent: 5301444 (1994-04-01), Horiuchi
patent: 5435086 (1995-07-01), Huang
patent: 5458012 (1995-10-01), Liu
patent: 5463826 (1995-11-01), Horiuchi
patent: 5620353 (1997-04-01), Lai
patent: 5743780 (1998-04-01), Liu
patent: 5915853 (1999-06-01), Guilin
Davis Cassandra H.
Dougherty & Troxell
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