US PATENT SUBCLASS 299 / 42
.~ Sidewall-working (e.g., drum-type cutter)

Current as of: June, 1999
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299 /   HD   MINING OR IN SITU DISINTEGRATION OF HARD MATERIAL

29  DF  HARD MATERIAL DISINTEGRATING MACHINES {17}
42.~ Sidewall-working (e.g., drum-type cutter) {4}
43  DF  .~.~> With material-handling means {3}
47  DF  .~.~> Driven flexible member causes advance {2}
51  DF  .~.~> Horizontal cutter tooth orbit {1}
53  DF  .~.~> Vertical cutter tooth orbit {1}

DEFINITION

Classification: 299/42

(under subclass 29) Apparatus in which the cutter is described as breaking up material which forms a substantially vertical wall as the cutter advances parallel to said wall.

(1) Note. Sidewall working must be specifically disclosed for classification under this definition.

(2) Note. This definition provides for mining machines of the "longwall" type. The principal distinction of machines under this definition is in the relatively long distance of sustained advance and the problem of handling the broken up material from the sidewall of an underground passage.

SEE OR SEARCH THIS CLASS, SUBCLASS:

34.1, and the search there noted for a machine which advances a planer type cutter, such cutter commonly disclosed as working on a sidewall.