Roof bit coupling

Details Roof bit coupling Roof bit coupling

E - Fixed Constructions

21

B

255/59

E21B 17/04 (2006.01) B23B 31/113 (2006.01) E21B 17/046 (2006.01)

Patent

CA 1157461

CR-1259 ROOF BIT COUPLING ABSTRACT A quick release, high torque coupling for interconnecting the bit and drive member in a mine roof drill has axial-locking and torque-transmitting structure integral with the drill members. A plug on the drive member is adapted to be releasably received within a mating socket in the bit and has an axial-locking segment on its outermost end complementally configured with respect to an acircular constriction in the socket to permit insertion of the axial-locking segment into the socket beyond the constriction. A torque transmitting segment on the plug cooperates with the constriction to limit relative rotation of the bit and drive member between oppositely directed torque-transmitting positions. In one of the torque- transmitting positions, the constriction and axial-locking segment are misaligned such that the plug is restrained against axial retraction from the socket. -1-

381450

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