Importance

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Abstract

A rotary mineral winning/rock cutting head 1 comprises a plurality of water discharge nozzles 8, at least one supply conduit 23, 24, 25, 26, 28, 30, 35, 36, 37 to convey, in use, pressurized water to the discharge nozzles 8 from a supply source, and valve means 38 associated with the or each conduit 23, 24 to permit or prevent a flow of water along the conduit(s) 23, 24, to achieve phased water control with water discharge from the nozzles 8 located in, or adjacent, the cut segment in the course of rotation of the head 1, and no discharge from the nozzles 8 located in, or adjacent, the non-cut segment, each valve means 38 comprising a rotary valve member 43, with an actuator shaft 45 operable on the valve member 43 to rotate the latter through 'on' and 'off' positions, and at least one arm 50 extending radially from the actuator shaft 45 and adapted, upon rotation of the head 1, to be displaced by contact with, and/or guidance by, an abutment device 53 to cause rotation of the arm 50, and hence both its actuator shaft 45 and rotary valve member 43, through an arc of a circle, so as to displace the valve member 43 from an 'on' position to an 'off' position, or from an 'off' position to an 'on' position.

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First Claim