Abstract: A needle holder for use with a double ended blood collection needle having a first sharpened end and a second sharpened end and a hub intermediate the first and second ends of the needle, and an evacuated blood collection tube stoppered at one end by a rubber-like stopper. The needle holder includes a rotatable sleeve mounted on the needle hub holding end of the needle holder. The sleeve has an end wall adjacent the end wall of the needle holder, the end wall of the sleeve defining an oval aperture therethrough. The end wall of the needle holder defines a recess for receiving the needle hub so as to prevent rotation of the needle hub with respect to the needle holder. As the sleeve is rotated with respect to the needle holder, portions of the end wall of the sleeve adjacent the oval aperture are caused to overlie portions of the needle hub, thereby preventing axial displacement of the needle with respect to the needle holder.

Abstract: In a CRT display device system, an upper assembly, including the display device, is tiltable on a supporting base assembly. A gear segment at each end of the upper assembly rests on a pair of pinions on the base assembly. The radius of curvature of each gear segment is centered on a horizontal line passing across the display device and through or near the center of gravity of the upper assembly. As the upper assembly is tilted, it pivots about this line and therefore remains substantially in balance for all angles of tilt. To provide static rest pressure to prevent unwanted tilting movement and also to minimize backlash, the pinions in each pair are coupled together through an idler pinion.