Percussion mechanism for a drill rod unit

Details Percussion mechanism for a drill rod unit Percussion mechanism for a drill rod unit

1992-04-24

1993-11-09

Phan, Hien H.

Tool driving or impacting

Impacting devices

Selective axial direction of impact

173129, E21B 102

Patent

active

052594645

ABSTRACT:
A drilling apparatus includes a drill rod unit having at least one drill rod; a percussion mechanism having a housing; a percussion piston having an axis and being slidably received in the housing; and a hydraulic system for generating pressures in the housing for effecting an axial reciprocation of the percussion piston in the housing for delivering blows to the drill rod unit in a direction parallel to a direction of reciprocation. The housing has opposite, axially aligned open ends and the percussion piston has a throughgoing axial passage in alignment with the open ends of the housing. The drill rod unit extends into the axial passage and has a counterface situated in a path of travel of the percussion piston for being impacted by an end thereof. The percussion mechanism is receivable on the drill rod unit at either selected side of the counterface for delivering blows to the drill rod unit in a selected one of two opposite directions.

REFERENCES:
patent: 2802340 (1957-08-01), Tallman
patent: 3701386 (1972-10-01), Feucht
patent: 4993504 (1991-02-01), Rodert et al.
patent: 5174386 (1992-12-01), Crover

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