Boring or penetrating the earth – Cutter element laterally shiftable below ground – Cutter element shifted by longitudinally relatively movable...
Patent
1982-06-02
1985-03-05
Novosad, Stephen J.
Boring or penetrating the earth
Cutter element laterally shiftable below ground
Cutter element shifted by longitudinally relatively movable...
175211, E21B 728
Patent
active
045025541
ABSTRACT:
An improved expansible rotary power tool for reaming frustoconical undercuts in cylindrical holes contained in dense concrete, such as flint and chert aggregates, comprises a tool having a hollow elongated sheath provided with a pair of opposing longitudinal slots adjacent to the cutting end of the tool. An upwardly biased tubular ram is reciprocally disposed within the sheath and is provided with a clevis at its cutting end which extends into the longitudinal slots, and a power engaging head at the end of the tool which projects out of hole being undercut. A load bearing collar mounted adjacent the power engaging end of the tool provides a stop against which the tool rests to determine the degree of advancement of the tool into the hole. A pair of elongated flat cutters are pivotally mounted back to back in the clevis of the ram, and advancement of the ram against the bias of the spring and into the hole flares the cutters outwardly through the slots to undercut the walls of the hole when the tool is rotated. Diamond impregnated cutting blades are mounted on a longitudinal recess along the cutting edge of the cutters with the plane of said diamond impregnated face being disposed at an acute angle of eighteen and five-tenths degrees to the cutting edge of the cutters. Cooling and flushing fluid is introduced into the tubular ram and is conveyed towards the cutters and through a pair of opposing beveled recess channels between the opposing backs of said cutters, thereby cooling and flushing said cutters during reaming.
REFERENCES:
patent: 2832568 (1958-04-01), Kammerer, Jr.
patent: 2953362 (1960-09-01), Thassy
patent: 3220478 (1965-11-01), Kinzback
Novosad Stephen J.
Starinsky Michael
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