DEVICE FOR COLLARING SUPPLEMENTARY SHAFT Russian patent published in 1994 - IPC

FIELD: drilling of multishaft boreholes. SUBSTANCE: device for collaring supplementary shafts includes anchor to fix device in borehole, packer installed above it with fixing mechanism composed of fixing split bushing with inner protrusions on tabs and branch pipe installed in mobile part of packer having shoulder for fixing in bushing. Branch pipe has slots for locating arms mounted in body. Deflection wedge is set above packer, it has pins for mounting and lifting to surface and threaded bushing in central hole. Housing which lower end has screw cuts terminated in pockets is connected to deflection wedge with sinking and lifting. Number of cuts conforms to number of pins of deflection wedge. Body carries sheared locating arms to fix deflection wedge with respect to body for sinking installed in body. Striking mechanism is mounted above withdrawing mechanism for removal of deflection wedge. EFFECT: expanded operational capabilities. 3 dwg