Connection for transmitting torque and axial forces

A connection for connecting a first member with a second member, the connection comprising:

• (a) a torque transmitting connection between the first member and the second member;
• (b) an axial force transmitting connection between the first member and the second member, the axial force transmitting connection comprising:
• (i) a first exterior shoulder on an exterior surface of the first member, wherein the first member has a first member connection end, wherein the first exterior shoulder is transverse to an axis of the first member, and wherein the first exterior shoulder faces away from the first member connection end;
• (ii) a second exterior shoulder on an exterior surface of the second member, wherein the second member has a second member connection end, wherein the second exterior shoulder is transverse to an axis of the second member, wherein the second exterior shoulder faces away from the second member connection end, and wherein the second exterior shoulder is discontinuous;
• (iii) a first collar having an interior surface and a first interior shoulder on the interior surface for engaging with the first exterior shoulder;
• (iv) a second collar having an interior surface and a second interior shoulder on the interior surface for engaging with the second exterior shoulder, wherein the second interior shoulder is discontinuous, and wherein the second exterior shoulder and the second interior shoulder define complementary gaps which enable an alignment between the second collar and the second member which permits the second collar to move past the second exterior shoulder and an alignment between the second collar and the second member which enables the second interior shoulder to engage with the second exterior shoulder;
• and
• (v) a collar connection between the first collar and the second collar, for transmitting at least tensile axial forces between the first collar and the second collar.