BORING DEVICE Russian patent published in 2004 - IPC

FIELD: boring equipment engineering. SUBSTANCE: device has mast, rotor with inserts, bed fork, swivel with assembly for connecting to mast guides. Said assembly is made in form of ring-shaped body with support legs and inner profiled portion. Main leading pipe is made with longitudinal port and profiled portion in upper part. Intermediate leading pipe has joint device for increasing and decreasing boring pipe lengths and also has a profiled part. Main and intermediate leading pipes are connected to bearing assembly and are provided with connecting sleeve, which has drive for switching itself from operating position into position for increasing and decreasing boring pipe lengths. Sleeve is mounted moveably on profiled portion of intermediate leading pipe and is made with profiled inner and profiled outer surfaces. Device for increasing and decreasing boring pipe lengths is made with capability of removal through longitudinal port of main leading pipe. EFFECT: increased effectiveness. 5 cl, 1 dwg