Abstract: A rotary coupling for two different fluids. The coupling includes a fixed housing and hollow shaft mounted rotatably but axially immovably in the housing. The shaft is provided with a central through-flow channel for a first fluid and at least one second through-flow channel parallel thereto for a second fluid. In the housing there are provided two separate supply channels for the two fluids and two sliding ring sealing devices between these channels and the hollow shaft, arranged coaxially with an axis of rotation of the hollow shaft, through which sealing devices the fluids can be fed separately to the through-flow channels.

Abstract: In a draw-bar mechanism for moving the collet of a chuck or the like on a spindle of an automatic turning machine toward its axial clamping position and for thereafter closing the collet more slowly with greater force about a tool or workpiece to be clamped, motion is transmitted from an actuating sleeve to a draw bar or like control member by spherical thrust members movably confined between three faces obliquely inclined relative to each other. A first face is fixed relative to the spindle assembly and has one section parallel to the axis and another axially contiguous section obliquely inclined relative to the axis, the two sections merging in an exposed edge. A second face is fixed relative to the control member, and the third face is fixed relative to the actuating sleeve and has two axially consecutive sections obliquely inclined relative to each other.