| 摘要 |
A dart flight rotation shaft and dart flight rotation shaft assembly. The dart flight rotation shaft is preferably, but not necessarily, integral and comprised of a cylindrical forward portion preferably, but not necessarily, uniform of substantially uniform diameter, and a flight mating portion having an outer diameter having one or more portion(s) of larger extension and/or smaller recess diameter than its remaining portion(s) to enable it to mate at such portion(s) in a slip-fit with one or more respectively smaller and/or larger inner diameter cavity portion(s) of a dart flight. The dart flight rotation shaft assembly is comprised of the foregoing dart flight rotation shaft on which there is mounted a snap-on, rotatable flight comprised of a flight bushing tube located along the central axis of said flight, a plurality of vanes or fins equally spaced around said flight bushing tube and an axial cavity those inner diameter has a respective smaller and/or larger diameter portion(s) whose distance(s) and shape conform substantially to those respectively larger and/or smaller diameter portion(s) on the mating portion of said flight shaft to cause a slip-fit union therewith permitting said flight to rotate around said shaft. The flight rotation shaft and flight rotation shaft assembly are characterized in that no portion of said flight rotation shaft attachment is external to any external surface of said flight.
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