Self positioning dust seal holder

Details Self positioning dust seal holder Self positioning dust seal holder

1992-08-27

1993-12-14

Dang, Hoang C.

Boring or penetrating the earth

With above-ground means for handling drilling fluid or cutting

Fluid or cuttings directing or receiving means engaging bore...

175209, E21B 2100, E21B 1504, E21C 702

Patent

active

052693864

ABSTRACT:
A drilling apparatus, having a drilling tower, tiltable for angle drilling, on a drilling platform with an aperture for a drill string, includes a dust seal holder that extends into the aperture in the platform, the dust seal holder being connected to the tower, so as to move up and down in the aperture in an arcuate path along with the drilling tower, as the tower is tilted for angle drilling, the dust seal holder being disconnected from the tower, so as to be not movable, as the tower is moved between a horizontal and vertical position.

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