Other methods or devices for dislodging with or without loading (breaking-down by means inserted in slits E21C27/14)

Child Classifications

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• E21C 37/005
• E21C 37/02 by wedges
• E21C 37/04 by devices with parts pressed mechanically against the wall of a borehole
• E21C 37/06 by making use of hydraulic or pneumatic pressure in a borehole
• E21C 37/16 by fire-setting or by similar methods based on a heat effect (drilling by use of heat E21B7/14)
• E21C 37/18 by electricity
• E21C 37/20 by ultrasonic waves
• E21C 37/22 Hand tools or hand-held power-operated tools specially adapted for dislodging minerals (slitting machines guided solely by hand E21C25/64)
• E21C 37/26 Chisels or other cutting tools not mentioned before