Card – picture – or sign exhibiting – Display device with gas or liquid movement
Patent
1989-04-13
1990-07-10
Cranmer, Laurie K.
Card, picture, or sign exhibiting
Display device with gas or liquid movement
40407, 40409, 40439, G09F 1900
Patent
active
049398598
ABSTRACT:
A kinetic sculpture apparatus comprising a transparent tank filled with a transparent liquid and an air supply system wherein air bubbles are introduced along the bottom of the container and thus are distributed thorughout the liquid. Immersed in the liquid are a multiple of vessels that are substantially closed on their sides and top, and substantially open on their bottom. The vessels are weighted so that they have a negative buoyancy when holding a small amount of air but will become positively buoyant when they accumulate more air from the rising air bubbles. The vessels are also weighted so that their center of gravity remains below their center of buoyancy even when in a full positive state. The apparatus comprises techniques for releasing the air from the vessels at the top of their rise so that will sink back towards the bottom until they collect more air and rise again. Also techniques are provided for controlling the movement of the individual vessels and arranging certain vessels to move in sequence with others.
REFERENCES:
patent: 1741692 (1929-12-01), Garaja
patent: 1976762 (1934-10-01), Barker
patent: 3144730 (1964-08-01), Johnson
patent: 3650056 (1972-03-01), Walton
patent: 3695607 (1972-10-01), Stouffer
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