Abstract: Apparatus for disinfection of lavatory instruments, medical instruments or the like, through ultraviolet radiation, wherein the instruments are arranged within a housing in combination with a mounting plate and irradiated by a light source which generates UV-radiation. The apparatus is designed to achieve the highest possible degree of effectiveness with a shadow-free irradiation of the instruments to be treated with simple manipulation of the apparatus. A receiving vessel with a take-up frame is insertable in the mounting plate, and the housing provided with openings is pivotable and engageable on arms of the mounting plate.

Abstract: On the tool spindle of a machine tool, a hollow ring is mounted on the headstock or on the sleeve flange thereof and is provided on its underside with an annular clearance forming an endless ring nozzle. A pressurized fluid is introduced into the channel of the hollow ring and passes out of the annular clearance in the form of a closed fluid curtain, so that a closed space surrounding the machining station is formed. So as to obtain a permanent seal with the fluid curtain, an annular element comprising a deflecting ring, a filter ring and a straightening ring is built into the annular channel and as a result the latter is subdivided into an upper and a lower partial ring channel. The suspended dust formed during the machining of a workpiece is held back by the fluid curtain, but the machining point is still visible and unimpeded access is possible.