Device for cooling the bits of a cutting machine

Details Device for cooling the bits of a cutting machine Device for cooling the bits of a cutting machine

E - Fixed Constructions

21

C

262/82

E21C 35/18 (2006.01) E21C 35/187 (2006.01)

Patent

CA 1177497

ABSTRACT OF THE DISCLOSURE The bits of a cutting machine are subjected to water under pressure by means of nozzles, water supply to the nozzles being freely supplied by a valve cone as soon as the bit within the bit holder is moved in axial direction against the force of a spring. Axial movement of the bit is effected by the cutting pressure and the shifting path of the bit is transmitted to the valve cone via a coupling member. The force of the spring is rated such that the spring presses the bit against its own weight and against the internal frictional resistance into its starting position in non-loaded condition with simultaneous closing of the valve cone. The restoring forces are, with connected conduits for pressurized water, substantially greater than the spring force, the active surface of the valve cone acted upon by the water pressure in the closing sense determining the force above which opening of the valve becomes possible. The valve is only opened above a minimum hardness of the rock and thus above a predetermined lower limit for the cutting pressure.

404395

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