Percussion drill and method of controlling same

Details Percussion drill and method of controlling same Percussion drill and method of controlling same

1988-12-30

1990-04-03

Novosad, Stephen J.

Boring or penetrating the earth

Processes

175296, 175 92, E21B 414

Patent

active

049132431

ABSTRACT:
A percussion drill provided with additional control phases in the form of a gentle braking phase for controlling the rearward movement, and a progressive braking phase for controlling forward movement. To this end, the control slide valve of the drill has a clearly defined gentle braking control edge, a new type of control channel having a cross-section which is variable along its length. The main advantages which are achieved as a consequence are substantially reduced compressed air consumption, substantially smoother operation even in relatively loose soil, and a considerably prolonged effective life.

REFERENCES:
patent: 2872158 (1959-02-01), Green
patent: 3692122 (1972-09-01), Curington
patent: 4200158 (1980-04-01), Perkins
patent: 4361195 (1982-11-01), Evans
patent: 4705118 (1987-11-01), Ennis
patent: 4785898 (1988-11-01), Kostyler et al.

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