Cutter head for rotary percussion drills

Details Cutter head for rotary percussion drills Cutter head for rotary percussion drills

1979-04-25

1981-10-13

Leppink, James A.

Boring or penetrating the earth

Bit or bit element

Bit with leading portion forming smaller diameter initial bore

175398, 175410, 175415, E21B 902

Patent

active

042943191

ABSTRACT:
A replaceable cutter head for rotary percussion drills having a pilot cutter on the end of a drill stem with a main cutter head surrounding the pilot cutter, the main cutter head having hammering/chipping cutters and milling cutters arranged along radial lines extending from the pilot cutter to the outer periphery of the main cutter head in alternate arrays, either along the radial cutter lines or on alternate radial cutter lines, or both.

REFERENCES:
patent: 1083666 (1914-01-01), Cook
patent: 2461305 (1949-02-01), Winn
patent: 2696973 (1954-12-01), Baumgartner
patent: 2759705 (1956-08-01), Bjorkman
patent: 3163246 (1964-12-01), Vagins et al.
patent: 3297101 (1967-01-01), Wohlmeyer
patent: 3299974 (1967-01-01), Clemmow
patent: 3469641 (1969-09-01), Reynolds
patent: 4026372 (1977-05-01), Hampson

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