Impact cam subassembly for drills

Details Impact cam subassembly for drills Impact cam subassembly for drills

1981-04-24

1983-10-11

Novosad, Stephen J.

Boring or penetrating the earth

Below-ground impact members

Continuous unidirectional rotary motion of one telescoping...

175306, 175325, E21B 410

Patent

active

044086709

ABSTRACT:
A sub assembly to be inserted between a drill string and a bit has a stabilizer sleeve to engage the walls of a bore hole and hold a first cam against rotation. A second cam is fixed to a drill holder at the lower end of the assembly and is driven in rotation by a rotary driving member extending through the assembly. The cams interengage so that relative rotation between them applies periodic impacts to the drill holder.

REFERENCES:
patent: 1745351 (1930-02-01), Bishop
patent: 1747020 (1930-02-01), Church et al.
patent: 2425012 (1944-03-01), Snyder
patent: 2495364 (1950-01-01), Clapp
patent: 2742264 (1956-04-01), Snyder
patent: 2742265 (1956-04-01), Snyder
patent: 3163237 (1964-12-01), Fulop
patent: 3268014 (1966-08-01), Drew
patent: 3389756 (1968-06-01), Kawamoto
patent: 4082151 (1978-04-01), Finney
patent: 4163478 (1979-08-01), Adcock

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