Cooling system for cooling the bits of a cutting machine

Details Cooling system for cooling the bits of a cutting machine Cooling system for cooling the bits of a cutting machine

E - Fixed Constructions

21

C

262/83

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

Patent

CA 1176665

ABSTRACT OF THE DISCLOSURE The invention provides a system for cooling the bits of a cutting machine and comprising a nozzle for the cooling water to be ejected under pressure, said nozzle being disposed in the vicinity of the bit, the water supply to said nozzle being closable by means of a shutoff valve and the bit being supported on the bit holder for limited axial movement under the action of the cutting pressure against the force of a spring and against the hydraulic pressure of the cooling water and the shutoff valve being coupled with the bit by a coupling member such that the shutoff valve is opened on movement of the bit in the direc- tion of the cutting pressure. In such a system the bit has the shape of a cap and encloses a bit shaft adapted to be inserted into the bit holder, the cap-shaped bit is supported on the shaft for movement in the axial direction and the shutoff valve and the coupling member are disposed within the bit shaft. The coupling member is a push rod acting on the closure member of the valve, said push rod being guided within a central bore of the bit shaft and the closure mem- ber closing the valve in the opposite direction to the action of the cutting pressure and being moved in an open position by the push rod in the direction of the acting cutting pressure. .

396819

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