Abstract: Techniques facilitating increased operational reliability for jib cranes are provided. In one example, a jib crane can comprise a mast, a shaft mechanism, and a rod. The mast can extend vertically from a base structure. The shaft mechanism can be disposed within the mast. The rod can be coupled to a boom arm and can be disposed within the shaft mechanism. Rotation of the rod can facilitate continuous rotation of the boom arm about a longitudinal axis of the rod with respect to the base structure.

Abstract: An alignment coupling and method of joining an extensible member of a linear actuator to an actuated member for moving a load utilize an enlarged coupler (A) carried by the extensible member within a receptacle in the actuated member formed by a transverse surface (B) and a longitudinal surface (C). A floating alignment is provided by a compressible resilient retaining member (D) permitting limited axial and radial adjustment of the extensible member. The receptacle has an open passageway for insertion of the coupler to facilitate assembly of the components thus providing a foreshortened alignment coupling.