DRILLING TOOL Russian patent published in 2000 - IPC

FIELD: mining; applicable in coring of geological prospecting wells with replacement of drill bit without lifting of pipes, mainly, in drilling tools with removable core receiver. SUBSTANCE: all tool mechanisms are made in form of single automated manipulator in which system of suspension and turning of crown and also of regimes switching over into operation-transportation positions consists of through round holes on crown side surfaces located concentrically to its trunnions. The latter are installed for engagement with locking sleeve supports and holes, for engagement with spring-loaded pin-retainers on transporter head. Made in the middle of transporter head is through slot for passage of rod-hammer lower part made with expansion in form of plate with side edge of cam profile and with possibility of location and turning in hollow of crown bit. Rod-hammer is made for limited angular displacement by means of flat spring, and slider connected with rod-hammer is spring- loaded relative to transporter body also by means of flat spring. Transporter head has stop bosses located on both sides of sail slot for upper end of crown and guide teeth for coupling recesses located in its upper part. Bushing lower part has slots for expanded part of rod- hammer. EFFECT: simplified drilling tool design, higher operate reliability and efficiency. 16 dwg