Boring or penetrating the earth – Cutter element laterally shiftable below ground – Pivoted about substantially longitudinal axis
Patent
1988-04-01
1989-10-17
Novosad, Stephen J.
Boring or penetrating the earth
Cutter element laterally shiftable below ground
Pivoted about substantially longitudinal axis
51332, 299 41, 405237, 408 80, 408180, 408187, E21B 1032
Patent
active
048740462
ABSTRACT:
The invention relates to improvements in rotary groove-cutting tools of the type having a rotatable center shaft and two or more generally arcuate flyweight subassemblies mounted for rotational movement with the center shaft, each such subassembly when thus rotated being also mounted for pivotally-hinged door-like movement between a retracted inoperative position and an extended operative one in contact with the wall of the bore to be grooved about eccentrically-located axes paralleling the center shaft but displaced radially therefrom, such improvements relating to the design and placement of the abrasive-surfaced cutters carried by each of the flyweight subassemblies which especially adapts them for use in grooving concrete bores. More specifically, the invention encompasses such cutters which are circumferentially elongate to an angular extent in which they are adapted to bridge most voids in the bore wall without jamming. In addition, two or more of these cutters are provided on each of the flyweight subassemblies arranged in vertically-stacked but circumferentially staggered relationship while remaining substantially overlapped.
REFERENCES:
patent: 1414840 (1922-05-01), Terrell
patent: 1739956 (1929-12-01), Emerson
patent: 2879038 (1959-03-01), Johnson
patent: 3690357 (1972-09-01), Lugo
patent: 4497383 (1985-02-01), Ostertag
Bagnell David J.
Hanes Richard W.
Novosad Stephen J.
Spangler, Jr. Edwin L.
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