Method and apparatus employing gravity to form a variable messag

Details Method and apparatus employing gravity to form a variable messag Method and apparatus employing gravity to form a variable messag

1997-07-18

1998-04-14

Davis, Cassandra

Card, picture, or sign exhibiting

Display device with gas or liquid movement

40407, G09F 1324, B05B 1708

Patent

active

057378606

ABSTRACT:
A device for forming a changeable sign from either gas bubbles rising within a body of liquid or from drops of liquid moving through the air. When using gas bubbles rising within a body of liquid, the gas bubbles are released sequentially such that a message of the sign is represented as a matrix of bubbles. When using drops of liquid moving through the air, the drops are released sequentially and controllably such that the message of the sign is represented as a matrix of drops of liquid. In one version, air bubbles are released near the bottom of a tank from controllable valves. The valves can be arranged in a single line or in a vertical matrix. As an alternative, a template having a message formed as a dot matrix is applied against a matrix of orifices from which gas escapes, to form the message. In another version, water drops are released from a row of controllable valves on a ballistic trajectory, e.g., a free-fall. As an alternative, the row of valves can be used normally to produce a continuous series of streams of water, but the streams can be interrupted while the message is produced from a dot matrix of drops.

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