Impact drill bit actuator

Details Impact drill bit actuator Impact drill bit actuator

1980-02-27

1981-09-15

Pate, III, William F.

Boring or penetrating the earth

Below-ground mechanical motion converting means relatively...

175298, 173123, E21B 100, E21B 410

Patent

active

042892104

ABSTRACT:
A rotary drive member such as a drill string, has a housing rotatably mounted at its lower end and an axial-throw cam is fixed at the lower end of the drive member in the housing. Chisel blades are axially slidable in the housing and are reciprocated by the cam in such manner that two dimetrically opposed blades are lifted and then forcibly driven downward while other chisel blades are left in contact with the well bottom to intermittently hold the housing against rotation. The chisel blades are sharpened in such a way that they tend to rotate the housing through a small angle at each downward impact.

REFERENCES:
patent: 1748341 (1930-02-01), Grant et al.
patent: 2072470 (1937-03-01), Thompson
patent: 2400853 (1946-05-01), Stilley
patent: 2673716 (1954-03-01), Avery

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