E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 10/24 (2006.01) E21B 10/10 (2006.01) E21B 10/28 (2006.01)
Patent
CA 2224372
The present invention relates to a cutter (10) for a raise boring head. The cutter (10) is rotatable about a center axis (14) and mounted, via a shaft (12) of the cutter (10), in a saddle secured to the raise boring head. The shaft (12) has ends (12A, 12B) that are secured to the saddle by fastening means (70). Bearing means (18, 20) are provided between the shaft (12) and a hub (16) of the cutter (10) in order to make it possible for the hub (16) to rotate relative to the shaft (12). Sealing means (33) between the shaft (12) and the hub (16), and bore/hole means (38, 38A, 48, 50) for introducing lubrication means into the interior of the cutter (10) are provided. An expansion plug (52) is mounted in the bore means (38, 38A). The expansion plug (52) is designed to accommodate lubrication means that enters into the bore means (38, 38A) from the bearing means (18, 20). A stopper means (62) is provided in the bore means (38, 38A). The stopper means (62) encases a part of the fastening means (70) and the stopper means (62) is arranged to prevent mud from entering the orifice of the bore means (38, 38A).
L'invention porte sur un trépan (10) pour tête de forage en montant tournant autour d'un axe central (14) et monté par l'intermédiaire de son axe (12) sur un étrier solidaire de la tête de forage, l'arbre (12) étant fixé par ses extrémités (12A, 12B) à l'étrier par un moyen de fixation (70). Des paliers (18, 20) sont prévus entre l'arbre (12) et le moyeu (16) du trépan (10) pour permettre la rotation dudit moyeu (16) par rapport à l'arbre (12). Sont également prévus des joints (33) entre l'arbre (12) et le moyeu (16), ainsi que des alésages/trous (38, 38A, 48, 50) servant à introduire un lubrifiant à l'intérieur du trépan (10). Un bouchon de dilatation (52) placé dans les alésages (38, 38A) est conçu pour recevoir le lubrifiant ayant pénétré dans lesdits alésages (38, 38A) par les paliers (18, 20). Un obturateur (62) placé dans les alésages (38, 38A) et entourant une partie des moyens de fixation (70) est conçu pour empêcher la boue de pénétrer par l'orifice des alésages (38, 38A).
Gowling Lafleur Henderson Llp
Sandvik Ab
Sandvik Intellectual Property Ab
LandOfFree
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