Patent ID: 7775779

Claim:
A system comprising: (a) a driver; (b) a driver shaft turned by the driver; (c) one or more pump stages on a pump shaft arranged in series, the pump shaft coupled to a thrust chamber shaft by a coupling member, the thrust chamber shaft coupled to the driver shaft; (d) the coupling member having a first axial chamber accepting a first end of the pump shaft, and a second axial chamber accepting a first end of the thrust chamber shaft, the axial chambers separated by a coupling plate; (e) the pump shaft having a female receptacle extending from the first end inward a distance and accepting a male portion of a pump shaft axial securing member; (f) one or more pump shaft shims positioned between the coupling plate and the first end of the pump shaft, the male portion of the pump shaft axial securing member passing through the shims and through the coupling plate; (g) the pump shaft axial securing member having a head which secures the shims against one side of the coupling plate, while the head itself is secured against an opposite side of the coupling plate; (h) the first end of the thrust chamber shaft secured in the second axial chamber by a two piece ring and a snap ring.