Abstract: A load balancing arm for a medical device support system includes a proximal hub, a support arm, a link, and a distal end vertical block. The components together may form a four bar linkage. The proximal hub is configured for pivotable movement about an axis P-P. The distal hub is configured to support a medical device load for pivotable movement about an axis D-D. The distal hub is mounted to the distal end vertical block for pivotable movement between a first position in which the axis D-D is at a first angle relative to the axis P-P and a second position in which the axis D-D is at a second angle relative to the axis P-P, wherein the first angle is different than the second angle. A parallelism adjustment mechanism enables the axis D-D to be adjusted so as to be substantially parallel to the axis P-P.

Abstract: A fastener assembly includes a threaded bolt and a locking nut assembly. The threaded bolt includes at least one longitudinal groove. The locking nut assembly includes a nut adapted to threadingly engage the bolt, a locking ring adapted to engage the bolt and the nut, and a biasing member adapted to bias the locking ring. The nut includes a threaded bore dimensioned to receive the bolt and can include a plurality of teeth formed on a face of the nut. Alternatively, an insert ring can be received by the nut and the insert ring can include teeth. The locking ring includes at least one inwardly protruding tab dimensioned to be received by the at least one longitudinal groove of the threaded bolt and a plurality of teeth formed on a face of the ring. The teeth on the face of the locking ring cooperate with the teeth on the face of the nut, or insert ring, to inhibit removal of the nut from the bolt after the nut has been tightened.

Abstract: A fastener assembly includes a threaded bolt and a locking nut assembly. The threaded bolt includes at least one longitudinal groove. The locking nut assembly includes a nut adapted to threadingly engage the bolt, a locking ring adapted to engage the bolt and the nut, and a biasing member adapted to bias the locking ring. The nut includes a threaded bore dimensioned to receive the bolt and a plurality of teeth formed on a face of the nut. The locking ring includes at least one inwardly protruding tab dimensioned to be received by the at least one longitudinal groove of the threaded bolt and a plurality of teeth formed on a face of the ring. The teeth on the face of the locking ring cooperate with the teeth on the face of the nut to inhibit removal of the nut from the bolt after the nut has been tightened. A method for manufacturing the fastener assembly and a tool for use with the fastener assembly is also provided.