US PATENT SUBCLASS 241 / 221
.~.~.~ Circumferential or tangential flow of material (e.g., roll mills or roll and concave mills)

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

*  DD  APPARATUS {41}
198.1  DF  .~ Cooperating comminuting surfaces (e.g., jaw crusher) {5}
220  DF  .~.~ Rotary surface (or surfaces) {2}
221.~.~.~ Circumferential or tangential flow of material (e.g., roll mills or roll and concave mills) {7}
222  DF  .~.~.~.~> With material feed and/or discharge mechanism or control {2}
226  DF  .~.~.~.~> With material retaining means at axial end of rotary surface
227  DF  .~.~.~.~> Both cooperating surfaces rotate (e.g., roll mills) {4}
237  DF  .~.~.~.~> With non-rotary surface moving means
238  DF  .~.~.~.~> With plural alternatively usable nonrotary surfaces and/or retractable rotor projections and/or adjustably or yieldably mounted rotary surface
239  DF  .~.~.~.~> Nonrotary surface adjustable or yieldable relative to rotary surface {2}
242  DF  .~.~.~.~> Cooperating non-smooth surface characteristics {1}

DEFINITION

Classification: 241/221

(under subclass 220) Apparatus in which the material flows circumferentially or tangentially of the rotary surface during the comminuting operation.

(1) Note. Many patents were found in which the flow of the material through the comminuting zone was both that as defined above and also that of subclasses 244+. The factor which was considered to determine the proper classification of these patents was the general path of the material through the machine as defined by the relative position of the inlet and outlet for the material, i.e., even though there was incidental movement of the material in a circumferential direction during comminution, the patent was classified under subclasses 244+, if the inlet and outlet of the devices were axially spaced.

(2) Note. A number of classes (see "Search Class" below) provide for the treatment of material between cooperating members in which the material has the defined movement. See the notes to subclass 227 for references to such classes which provide for plural rotating surfaces.

SEE OR SEARCH THIS CLASS, SUBCLASS:

142+, and 158+, for plural devices of the defined type.

189.1+, for devices providing for similar flow of material relative to rotary striking members. 204, for devices providing for similar flow of material relative to compound movement surfaces.

SEE OR SEARCH CLASS

100, Presses,

155+, and see the Notes thereto for roll type presses, not elsewhere classified.

452, Butchering,

143, and 145.

460, Crop Threshing or Separating,

46, and 59+.