US PATENT SUBCLASS 241 / 69
.~.~ Comminuted material discharge permitting screen

Current as of: June, 1999
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241 /   HD   SOLID MATERIAL COMMINUTION OR DISINTEGRATION

*  DD  APPARATUS {41}
68  DF  .~ With separation or classification of material {7}
69.~.~ Comminuted material discharge permitting screen {3}
70  DF  .~.~.~> Screen partition or end wall in rotary drum {1}
73  DF  .~.~.~> Arcuate screen concentric with rotary comminuting member
74  DF  .~.~.~> Annular screen above or surrounding comminuting zone

DEFINITION

Classification: 241/69

(under subclass 68) Apparatus in which the separating means comprises a screen or grating so arranged relative to the comminuting mechanism as to allow the discharge of sufficiently comminuted material during the comminuting operation, while the oversize material is retained within the comminuting zone for further treatment.

(1) Note. The line maintained between this group and subclasses 79+ is that where the material has been fed to a screen from the comminuting zone in such a way that a conveyor (other than the comminuting elements) would be necessary to return it to the zone, then the material has not been merely retained within the zone, as is necessary for this group, and the device is properly classifiable in subclasses 79+. However, where the arrangement is such that following treatment by the comminuting elements the material is so fed to the screen that the oversize is presented again to the comminuting elements by mere gravity flow or by action of the comminuting elements, then it is considered that the oversize has been merely "retained" as defined above, and

such devices are classified here.

SEE OR SEARCH THIS CLASS, SUBCLASS:

49+, for discharge permitting screens associated with means to apply a fluid to the material to convey it to the screen.

83+, for comminutors provided with discharge permitting screens but in which the screen elements acts to accomplish at least a portion of the comminuting operation (see (1) Note under subclass 68).

SEE OR SEARCH CLASS 209, Classifying, Separating, and Assorting Solids,

233+, and the notes thereto for sifters, per se.