Abstract: A turbine vibrator including a housing having a first end and a second end and a generally cylindrical internal surface forming a cylindrical central chamber. An end cap is attached to each end of the housing including one or more outlet ports in fluid communication with the central chamber. A turbine wheel is located within the central chamber of the housing and is rotatably supported by the end caps. The turbine wheel includes a central shaft, a cylindrical wall extending concentrically about the central shaft, and an eccentric weight extending between the shaft and the cylindrical wall. A rotor including a plurality of teeth formed from an elastomeric material extends around the cylindrical wall. A cap cover including one or more outlet ports is attached to each end cap with a muffler member disposed between the outlet ports in the end cap and the outlet ports in the cap cover.

Abstract: A tensioning device for imparting torsional bias to a shaft. The tensioning device includes an adapter member connectable to the shaft for conjoint rotation therewith. A first hub member is selectively rotationally engageable with the adapter member. A first coupling member is attached to the first hub and a second coupling member is attached to the adapter member. The coupling members provide selective rotational engagement of the first hub member to the adapter member such that the first hub member and the adapter member are relatively rotatable with respect to one another through a preselected degree of relative rotation and such that the first hub member is engageable with the adapter member upon sufficient relative rotation of the first hub member in a first rotational direction with respect to the adapter member such that further rotation of the first hub member provides a corresponding rotation of the adapter member in the first rotational direction.