CORE DRILLING TOOL Russian patent published in 1999 - IPC

FIELD: bore-hole drilling technology. SUBSTANCE: tool is used for drilling bore-hole together with coring. Tool has means for preventing direct contact of personnel with core receiver filled with radioactive core in process of manipulation with it and with core samples themselves when removing them from core receivers and placing into transportation container. Core drilling tool has external pipe with drill bit and internal core-receiving pipe with core gripper, bearing unit and detent. Internal pipe together with core gripper are installed in housing with possibility for core gripper to extend from it and together with housing it is installed into external pipe for possible combined withdrawal from it by means of tightening coupling. This tightening coupling is made in the form of thrust shoulder on housing end bore, catching circular shoulder on core gripper body and screw pair in the form of adapter to core receiver pipe. Adapter has upper section with external thread and clamping nut on thread keeping contact with housing. Additionally introduced into core drilling tool is core extractor made in the form of load-bearing rod with tightening coupling and core receiving pipe. Thickened section of rod has external thread and nut on it. Application of aforesaid core drilling tool excludes manual handling due to remote manipulation and use of protective screens. EFFECT: higher efficiency. 3 dwg