Adapter device for percussion drill

Claim 1

AN ADAPTER DEVICE FOR CONNECTING A PERCUSSION DRILLING MACHINE WITH A DRILL COMPRISING A CENTRAL DRILL ROD AND A SURROUNDING DRILL TUBE, SAID ADAPTER DEVICE CONSISTING ESSENTIALLY OF A SHANK ADAPTER, AN ADAPTER SLEEVE AND A FLUSHING BOX, SAID SHANK ADAPTER HAVING A REAR END PORTION SHAPED FOR CONNECTION TO A PERCUSSION DRILLING MACHINE, A FRONT END PORTION HAVING AN INTERNALLY THREADED AXIAL RECESS FOR CONNECTION TO A DRILL ROD AND AN EXTERNALLY THREADED PORTION FOR CONNECTION TO SAID ADAPTER SLEEVE AND BETWEEN SAID REAR AND FRONT PORTIONS AN INTERMEDIATE PORTION OF CIRCULAR CROSS SECTION, SAID SHANK ADAPTER HAVING ALSO A CENTRAL FLUSHING CHANNEL EXTENDING FROM THE REAR END SURFACE OF SAID REAR END PORTION TO SAID AXIAL RECESS AND AT LEAST ONE FLUSHING CHANNEL PARALLEL TO SAID CENTRAL FLUSHING CHANNEL AND EXTENDING FROM AN ORIFICE IN THE SURFACE OF SAID PORTION OF CIRCULAR CROSS SECTION TO THE FRONT END SURFACE OF SAID FRONT END PORTION BETWEEN SAID AXIAL RECESS AND SAID EXTERNALLY THREADED PORTION, SAID ADAPTER SLEEVE HAVING AN INTERNALLY THREADED REAR END PORTION CONNECTED TO SAID EXTERNALLY THREADED PORTION OF SAID SHANK ADAPTER AND A THREADED FRONT END PORTION OF CONNECTION TO THE DRILL TUBE OF A DRILL, AND SAID FLUSHING BOX BEING JOURNALLED ON SAID PORTION OF CIRCULAR CROSS SECTION OF SAID SHANK ADAPTER AND HAVING A CHANNEL COMMUNICATION WITH SAID ORIFICE AND A CONNECTION FOR SUPPLYING FLUSHING MEDIUM TO SAID CHANNEL.