US PATENT SUBCLASS 414 / 331.12
.~ Rack formed by rotatable screws

Current as of: June, 1999
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414 /   HD   MATERIAL OR ARTICLE HANDLING

331.01  DF  MOVABLE RACK HAVING SUPERPOSED, CHARGE-SUPPORTING ELEMENTS, AND EXTERNAL MEANS FOR CHARGING OR DISCHARGING ELEMENTS {5}
331.12.~ Rack formed by rotatable screws

DEFINITION

Classification: 414/331.12

Rack formed by rotatable screws:

(under subclass 331.01) Subject matter wherein the rack comprises a cylindrical member which turns about a vertical axis and having a plurality of helical or spiral ribs or

threads which engage and advance the load parallel to the axis of rotation.