E - Fixed Constructions – 21 – C
Patent
E - Fixed Constructions
21
C
262/76
E21C 25/06 (2006.01) E21C 35/18 (2006.01) E21C 35/187 (2006.01) E21C 35/23 (2006.01)
Patent
CA 1221711
ABSTRACT OF THE DISCLOSURE For cutting rock by means of cutting head having its bits cooperating over a limited axial shifting stroke with a cylinder-piston-aggregate, for example a valve, it is proposed to intermittently subject the cylinder-piston-aggregate to the action of pressurized fluid, thus exposing the bit during its engaging the rock to percussion forces. During the phases lack- ing any action of pressurized fluid onto the cylinder-piston- aggregate, the bit shall be pushed into its starting position. This embodiment can be realized with both hydraulic and pneumatic cylinder-piston-aggregates, noting that in case of an embodiment having a hydraulic cylinder-piston-aggregate it is preferred to design this cylinder-piston-aggregate as a valve which simulta- neously provides the possibility to expel pressurized liquid via a spraying nozzle onto the mine face.
451676
Maier Wilfried
Schetina Otto
Siebenhofer Gottfried
Wrulich Herwig
Marks & Clerk
Voest - Alpine Aktiengesellschaft
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