E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
255/57
E21B 3/06 (2006.01) E21B 19/24 (2006.01)
Patent
CA 2011261
Abstract The invention relates to a travelling centralizer arrangement in a rock drill (2), comprising a travelling centralizer (5) movable along the feeding beam (1) during the drilling. The travelling central- izer (5) of the arrangement comprises two jaw halves (12a, 12b) mounted in a carriage (8) provided for the travelling centralizer so as to be pivoted about journals (13a, 13b) parallel to the feeding beam (1). Each jaw half (12a, 12b) comprises a wheel (9a, 9b) moving along the guideways (10) of the feeding beam (1) and keeping the jaw halves (12, 12b) pressed against each other during normal drilling so that jaws (14a, 14b) form a drill rod centralizer con- centric with the drill rod (4). The guideways (10) comprises at the forward end of the feeding beam (1) a portion (L) which extends downward from the straight guideway portion. When the travelling centralizer reaches this downwardly extending guide- way portion, the wheels (9a, 9b) are displaced down- ward along the surface of the guideways, so that the jaw halves (12a, 12b) are pivoted about the journals (13a, 13b), thus drawing the jaws (14a, 14b) of the travelling centralizer apart from each other so that the chuck (3) is able to pass therethrough. (Fig. 2)
Gowling Lafleur Henderson Llp
Oy Tampella Ab
Rajakallio Pauli
LandOfFree
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