公开(公告)号：AU650392B2

公开(公告)日：1994-06-16

申请号：AU4442293

申请日：1993-08-04

Applicant: INGERSOLL RAND CO

Inventor： SCHIVLEY GEORGE P JR ,  CONNELL STUART A

IPC: E21B7/02 ,  E21B15/04 ,  E21B21/015 ,  E21C7/00

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.

公开(公告)号：ZA9305699B

公开(公告)日：1994-03-03

申请号：ZA9305699

申请日：1993-08-05

Applicant: INGERSOLL RAND CO

Inventor： SHIVLEY GEORGE P JR ,  CONNELL STUART A

IPC: E21B7/02 ,  E21B15/04 ,  E21B21/015 ,  E21B ,  E21C

CPC classification number: E21B7/02 ,  E21B15/04 ,  E21B21/015