E21C27/20 - CPC Classification Index

ClassID:

135811 ⎘

E21C27/20 - CPC Classification

Classification description:

Machines which completely free the mineral from the seam Mineral freed by means not involving slitting

Sub-classes:

E21C27/22 » by rotary drills with breaking-down means, e.g. wedge-shaped drills, {i.e. the rotary axis of the tool carrier being substantially perpendicular to the working face, e.g. MARIETTA-type } 30
E21C27/24 » by milling means acting on the full working face, {i.e. the rotary axis of the tool carrier being substantially parallel to the working face } 134
E21C27/26 » by closely adjacent cutter chains acting on the full working face 1
E21C27/28 » by percussive drills with breaking-down means, e.g. wedge-shaped tools 14
E21C27/30 » by jaws, buckets or scoops that scoop-out the mineral 34
E21C27/32 » by adjustable or non-adjustable planing means with or without loading arrangements 13
E21C27/46 » by percussed planing means 2

Recent Application in this class:

20210032989

Cutting device with tapered cutting element

20200355074

Vehicle body utilized in rockbreaker, rockbreaker and rock breaking method

20200217198

Cutting head having segmented cutting disc

20170342835

Cutting device with tapered cutting element

20160265354

MINING MACHINE WITH DRIVEN DISC CUTTERS

20130187436

Coal caving cycle

20130057044

Mining machine with driven disc cutters

20110227397

Mining machine with driven disc cutters

20090058172

Mining machine with driven disc cutters