ROTARY CUTTING TOOL Russian patent published in 1999 - IPC

FIELD: bore-hole drilling machinery and equipment. SUBSTANCE: rotary cutting tool has cutting head with front end located along axis and rear end directed along axis. Cutting head is provided with at least one cutting strip located in front end along axis of cutting head. Hollow is made in cutting head. This hollow is provided with opening in rear end of cutting head. Wall of hollow restricts its dimensions. In addition, cutting head has at least one pipeline for delivery of cooling agent in its front end in direction of axis. Pipeline is connected with hollow. Rotary cutting tool incorporates holder having front end in direction of axis and rear end in direction of axis. In assembly of cutting head and holder, front end of holder in direction of axis is located inside hollow of cutting head. In this case, one sealing member is located between front end of holder and wall of cutting head hollows. Another sealing member is located in rear part of holder so as to ensure sealing between holder and wall which limits dimensions of bore in drilling rod. This bore is intended for delivery of cooling agent. Aforesaid embodiment of rotary drilling tool ensures protection of fluid pipelines from plugging by dirt. Operator is also protected from spitting with cooling agent. EFFECT: higher efficiency. 12 cl, 6 dwg