A coupling comprises a pair of clutch end members, a clutch center member disposed between the clutch end members, and an actuator coupled to one of the end members. Each end member includes concentric V-grooves disposed on a respective face thereof. The center member is axially movable between the end members, and includes a pair of opposing surfaces. One of the opposing surfaces includes concentric V-grooves configured to mesh with the V-grooves of one of the end members. Another of the opposing surfaces includes concentric V-grooves configured to mesh with the V-grooves of another of the end members. The actuator is configured to simultaneously couple the end members to the center member by urging the V-grooves of both of the end members into engagement with the V-grooves of the center member.

A coupling comprises at least two inter-connected torque couplings. Each torque coupling includes a pair of clutch end members, a clutch centre member disposed between the clutch end members, and an actuator coupled to one of the end members. The end members and the centre member each includes a set of concentric V-grooves each disposed on a respective face thereof. The centre member is axially movable between the end members. The actuator is configured to simultaneously couple the end members to the centre member by engaging the V-grooves of both of the respective end members with the V-grooves of the centre member. The centre member of one of the torque couplings comprises one of the opposing surfaces of the one torque coupling, another of the opposing surfaces of the one torque coupling and one of the end members of another of the torque couplings.

A coupling comprises at least two inter-connected torque couplings. Each torque coupling includes a pair of clutch end members, a clutch centre member disposed between the clutch end members, and an actuator coupled to one of the end members. The end members and the centre member each includes a set of concentric V-grooves each disposed on a respective face thereof. The centre member is axially movable between the end members. The actuator is configured to simultaneously couple the end members to the centre member by engaging the V-grooves of both of the respective end members with the V-grooves of the centre member. The centre member of one of the torque couplings comprises one of the opposing surfaces of the one torque coupling, another of the opposing surfaces of the one torque coupling and one of the end members of another of the torque couplings.