US PATENT SUBCLASS 40 / 505
.~.~.~.~ Carrier with common positive drive

Current as of: June, 1999
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40 /   HD   CARD, PICTURE, OR SIGN EXHIBITING

446  DF  CHANGING EXHIBITOR {25}
493  DF  .~ Rotatable carrier for display item {7}
503  DF  .~.~ Plural cylindrical or polygonal rotatable carrier {1}
504  DF  .~.~.~ Biaxial {1}
505.~.~.~.~ Carrier with common positive drive

DEFINITION

Classification: 40/505

Carrier with common positive drive:

(under subclass 504) Device including drive means for rotating plural carriers which drive means produces rotation of a first carrier constantly proportional (e.g., 1:1, 2:1 ratio, etc.), to the rotation of a second carrier (e.g., carriers interconnected by sprocket chain drive, gear drive, etc.).