CUTTING ASSEMBLY FOR HYDRO-MECHANICAL SLIT DRILL Russian patent published in 2004 - IPC

FIELD: oil extractive industry.

SUBSTANCE: device has extending cantilever with hydro-monitoring headpiece made in single block with piston and connected by support axis to rotating links supporting axis of knurl. Into longitudinal groove of drill body a deflecting wedge is placed made in single block with sliding support having a groove for movement of knurl and removable inserts on slanting planes. Rotating links contact with the latter. Side plates are placed on both sides of deflecting wedge with grooves parallel to its slanting plane, in which ends of knurl axis are held. Below main knurl, deflecting wedge and rotating links a knurl is placed in additional longitudinal groove of drill with deflecting wedge and rotating links. Their support axis is connected to support axis of main rotating links by two plates placed on drill body on both sides of side plates and extending cantilever, being stopped against the piston. Support axis of additional links is placed in sliding case placed with possible longitudinal movement into insert bushing fixing a deflecting wedge of main knurl in drill body, which is fixed on the body by bolts. Deflecting wedge of additional knurl is fixed by glass with transversal shelf. The latter is held by lower nut in drill body, which has apertures covered by removable plugs against each support axis of rotating links.

EFFECT: prevented jamming of device in columns with damaged walls.

3 dwg