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| Number | Title | Issue Date |
| 6357577 | Conveyor arrangements with multiple shaftless screws 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... | 03/19/2002 |
| 5368153 | Transportation device having a driven shaftless spiral freely fitted in a casing and resting thereon 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 casi... | 11/29/1994 |
| 5092453 | Helical conveyor 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 s... | 03/03/1992 |
| 5000307 | Transportation device 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 di... | 03/19/1991 |
| 4984477 | Driving device 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 sli... | 01/15/1991 |
| 4961864 | Separating device 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... | 10/09/1990 |
| 4922768 | Driving device 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... | 05/08/1990 |
