Cutting machines, i.e. for making slits approximately parallel or perpendicular to the seam (dislodging machines with slitting means E21C27/02, E21C27/10, E21C27/18)

Child Classifications

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• E21C 25/02 Machines slitting solely by one or more percussive tools moved through the seam
• E21C 25/06 Machines slitting solely by one or more cutting rods or cutting drums which rotate, move through the seam, and may or may not reciprocate
• E21C 25/16 Machines slitting solely by one or more rotating saws, cutting discs, or wheels
• E21C 25/20 Machines slitting solely by one or more reciprocating sawing implements or reciprocating cutter chains; Shaker conveyors with cutting means
• E21C 25/22 Machines slitting solely by one or more cutter chains moving unidirectionally along jibs
• E21C 25/52 Machines incorporating two or more of the slitting means according to groups E21C25/02, E21C25/06, E21C25/16, E21C25/20 and E21C25/22
• E21C 25/54 Slitting by unguided cutter cables or cutter chains, or by unguided tools drawn along the working face by cables or the like (dislodging by planing means E21C27/32; propulsion by haulage cables E21C29/14)
• E21C 25/56 Slitting by cutter cables or cutter chains or by tools drawn along the working face by cables or the like, in each case guided parallel to the face, e.g. by a conveyor or by a guide parallel to a conveyor (pressing the conveyor equipped with tools toward the working face E21C35/14)
• E21C 25/58 Machines slitting by drilling hole on hole
• E21C 25/60 Slitting by jets of water or other liquid (picks with arrangement of fluid-spraying nozzles E21C35/187; distribution of spraying fluids in rotating cutter-heads E21C35/23)
• E21C 25/62 Machines for making slits approximately perpendicular to the seams either level with, or above or below the level of, the machine
• E21C 25/64 Slitting machines guided solely by hand and either carried by hand or mounted on supports (hand-held power-operated tools E21C37/22)
• E21C 25/66 Machines for making slits with additional arrangements for drilling
• E21C 25/68 Machines for making slits combined with equipment for removing, e.g. by loading, material won by other means (slitting machines combined with planing means E21C27/18; removing chippings E21C35/20)