Abstract: The present invention relates to a vertical conveyor (2) with double spirals (21, 31). The vertical conveyor (2) consists of a casing (20) and two shaftless spirals (21, 31). The spirals (21, 31) are driven each by a motor (24) via a gear and journal unit (25). The motors (24) are placed at the one short end of the vertical conveyor (2). The inlet (22) and outlet (23) of the conveyor (2) are disposed on opposite sides of the casing (20). The spirals (21, 31) are driven in opposite directions in such a manner that the material is “drawn” in at the inlet (22), while being “pressed” out at the outlet (23). This takes place thanks to the material being subjected to force components from the two spirals (21, 31) which act in the directions of the inlet (22) and the outlet (23), respectively. In a number of embodiments, a stationary shaft (33) is disposed within the spirals (21, 31) at least in the region of the inlet (22).

Abstract: A conveying apparatus for particulate material comprises a first conveyor combination including a first casing and a first shaftless spiral drive element, a second conveyor combination coupled to said first conveyor combination and including a second casing and a shaftless spiral drive element; and a elongated body coaxially arranged with respect to the first shaftless spiral.

Abstract: An apparatus for displacing material includes a transport thread composed of a central thread spiral and an outer thread. The outer thread spiral is fixed to one of the radially directed defining surfaces of the central thread spiral. The central thread spiral is dimensioned so as, without permanent deformation, to absorb at least the major portion of the mechanical forces occurring in the axial and radial direction of the transport thread. The outer thread spiral has an outer surface which faces away from the geometric centre axis of the transport thread and is of shorter extent in the axial direction of the transport thread and is located more distally from the center axis than the outer surface of the central thread spiral. By regulating the extent in the axial direction of the transport thread of the surface of the outer thread spiral turned to face the substrate, the abutment pressure of the transport thread will be adapted to the substrate in relation to the properties of the material being displaced.

Abstract: A conveying apparatus comprises a first conveyor combination including a horizontal casing and a horizontal shaftless spiral drive element, and a second conveyor combination including a vertical casing and a vertical shaftless spiral drive element. The discharge section of the first casing and the free end of the first driving element are directed from the side towards the center axis of the second casing. The casing of the second conveyor combination has a cross section having either a corner or a longitudinally extending rib to increase the friction between the casing and the material which abuts against the same.

Abstract: A driving device for producing substantially linear movement of a driver comprises a shaftless spiral rotatable around its longitudinal axis. The spiral encloses at least one sliding body which is provided with at least one element projecting from the sliding body which passes between two adjoining turns of the spiral. The sliding body co-operates with an element secured against rotational movement which prevents the sliding body from rotating with the spiral. An elongated element oriented in the axial direction of the spiral is connected at one end to the sliding body and at its other end to the element which is secured against rotational movement to form the driver. Upon rotation of the spiral, the sliding body and thereby the driver are moved in the axial direction of the spiral for moving the element secured against rotational movement.

Abstract: A method and device for the separation of substantially solid bodies from a liquid are disclosed in which an obliquely arranged screen grid is provided with an upper region, a lower region, and two opposite edge regions and is suppllied with liquid at the upper region to separate the solid bodies from the liquid in the form of screenings which travel along an upwards facing surface of the screen grid. A cleaning device rests against the upwards facing surface of the screen grid and moves the screenings during movement of the cleaning device horizontally towards the edge regions to cause the screenings to pass onto transport surfaces situated adjacent to the edge regions. The transport surface extends along the length of the screen grid and is smooth.

Abstract: A driving device comprising a shaftless spiral rotatable around its longitudinal axis and enclosed by a limiting structure. The limiting structure has a first end region and a second end region corresponding to each end of the spiral. The shaftless spiral encloses a sliding body which is provided with an element projecting radially from the sliding body, between two adjoining spiral turns of the spiral and has a part located radially outside the spiral turns in a slot oriented substantially in the axial direction of the limiting structure. A driving element rotates the spiral, which moves the sliding body and consequently the projecting element in the longitudinal direction of the spiral.