Patent ID: 8347761

Claim:
A drive system comprising: a first member having a non-conical section and a conical section, the non-conical section having alternating flutes and lobes, the conical section having alternating flutes and lobes, the lobes of the conical section tapering as they progress toward the non-conical section, the flutes of the conical section tapering as they progress toward the non-conical section; and a second member having a non-conical section and a conical section, the non-conical section of the second member having alternating flutes and lobes, the conical section of the second member having alternating flutes and lobes, the lobes of the conical section of the second member having a uniform width as the lobes progress from the non-conical section of the second member to an end of the second member, the flutes of the conical section of the second member having a width which tapers as the flutes progress in the conical section of the second member from the end of the second member to the non-conical section of the second member, wherein the alternating flutes and lobes of the non-conical section of the second member are configured to engage with the alternating lobes and flutes of the non-conical section of the first member, respectively, and wherein the alternating flutes and lobes of the conical section of the second member are configured to engage with the alternating lobes and flutes of the conical section of the first member.