Abstract: The invention comprises a tubing conduit system for transport of solid or liquid material with a transport air stream, which is driven by at least one vacuum source (1) driven by an electric driving motor (2) and comprises at least one closable feeding opening (8) for transport air and transported material, characterized in that the system is arranged to make possible control of the power delivered by the driving motor as a function of the transport air flow, so that the power at a low transport air flow value below an upper transport air flow limit value of a lower transport air flow range is maintained below an upper limit value within a lower power range, and the power at a high transport air flow exceeding a lower transport air flow limit value for a higher transport air flow range is maintained above a lower limit value for a higher power range, wherein the upper limit value of the lower power range amounts to at most 80% of the lower limit value of the higher power range, and a method for controlling th

Abstract: A tubing system composed of tube parts and connecting elements forming a flow-through channel. The tube parts are of low elasticity material and the connecting elements are of high elasticity material. At least one connecting element is shaped for changing the speed and/or the direction of movement of a product flowing through the connecting element, wherein at least two of the tube parts of low elasticity material are connected together with a connecting element.

Abstract: A tubing system composed of tube parts and connecting elements forming a flow-through channel. The tube parts are of low elasticity material and the connecting elements are of high elasticity material. At least one connecting element is shaped for changing the speed and/or the direction of movement of a product flowing through the connecting element, wherein at least two of the tube parts of low elasticity material are connected together with a connecting element.

Abstract: A dental or surgical handpiece which operates on the basis of laser includes a light guide for the laser which, in order to ensure the relative rotation between supply hose and handpiece, is arranged concentrically in the coupling between the supply hose and the handpiece. The light guide of the supply hose extends in one piece into the handpiece and, starting from the coupling with the supply hose, the light guide is displaced increasingly eccentrically toward the inner side of the bend of the angle piece, and the end of the light guide is rotatably mounted in a receiving unit of the handpiece.

Abstract: The invention relates to a flexible tube device, which is repeatedly reshapable by action of reshaping forces comprising bending forces and which has the capability of substantially maintaining its shape received by the reshaping as the forces are released. This device is characterized in that the device (1) comprises a flexible part comprising a flexible inner hose (3) and/or a flexible outer hose, which may surround the flexible inner hose (3) and be provided along substantially the entire flexible part and preferably inside the outer hose, outside the inner hose or between the outer hose and the inner hose, a bend stiffening member (4) which is plastically deformable at the reshaping of the tube device and which after the removal of the reshaping forces substantially retains the shape received by the plastic deformation and thereby substantially determines the shape of the tube device.

Abstract: A cyclone separator has a filter unit which is disposed inside a central outlet between an inlet chamber of the cyclone separator (for gas mixed with dust) and an outlet chamber thereof (for clean gas) connected to a suction source. A method is provided for cleaning such a cyclone separator by momentarily establishing a connection between the outlet chamber and the atmosphere. The communication between the inlet chamber and the suction source being maintained, to initiate a rapid pressure rise in the outlet chamber and thus a reverse gas flow through the filter unit. The outlet chamber of the cyclone separator has a valve controlled aperture for connecting the outlet chamber to the atmosphere, a closure member of the valve being biased to a closed position by existing pressure difference between the outlet chamber and the atmosphere.

Abstract: A dust separator, comprising a fan (27) with a drive motor (28), a cyclone separator (10, 11) which is connected to the suction side of the fan and is arranged as a coarse separator and provided with an inlet (11) for gaseous fluid mixed with dust, a filter (29-32) which projects freely coaxially into the cyclone apparatus (10, 11) and is arranged as a fine separator between the interior of the cyclone apparatus and the suction side of the fan, and an outlet (37) for cleaned gaseous fluid at the pressure side of the fan.The filter (29-32) and the suction fan (27) with the drive motor (28) are arranged as a separate unit resiliently connected to the cyclone apparatus (10, 11). The filter (29-32) consists of a pleated outer cover (30) of filter material which is disposed round a perforated tubular core (29) and which is clamped between its ends and the pleats of which extend axially along the core (29) and are fixed to this at their inner folding edges, while the outer folding edges are free.