Self positioning dust seal holder

Details Self positioning dust seal holder Self positioning dust seal holder

E - Fixed Constructions

21

B

E21B 21/015 (2006.01) E21B 15/04 (2006.01) E21C 7/00 (1995.01)

Patent

CA 2101668

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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