Structure of the rotary type crystal ball

Details Structure of the rotary type crystal ball Structure of the rotary type crystal ball

1990-08-07

1992-02-18

Dorner, Kenneth J.

Card, picture, or sign exhibiting

Three-dimensional movable figure display device

446236, 272 31R, 84 952, 74 63, G09F 1908

Patent

active

050882180

ABSTRACT:
The invention relates to an improved structure of a water-filled rotary type crystal ball. Its major structure includes the elements of a rotary disc, a fixed base, a rubber plug, an elastic axle, and a drive shaft. By means of the above structure, when the range of hot expansion and cold shrinkage of the clear water in the crystal ball is quite large, the expansion or shrinkage will be absorbed by the rubber plug and drive shaft so that the crystal ball will not leak and the drive shaft will not interfere with the normal state of rotation or break down. Also, the structure of the invention permits an easy and simple assembling process so that the manufacturing costs of the components are greatly reduced.

REFERENCES:
patent: 2892327 (1959-06-01), Kressin
patent: 4757986 (1988-07-01), Hwang et al.
patent: 4771902 (1988-09-01), Teng
Drawing of Prior Art showing Elastic Drive Train (Fig. 5).

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