Volkmann stationary and mobile hoists simplify the handling and positioning of vacuum conveyors above machines or bins being fed with material. With Volkmann hoists, the vacuum conveyor can be brought into position, connected dust-free, powder tight, and without the weight of the conveyor resting on the vessel beneath, enhancing process stability in critical operations such as tablet presses or filling machines. Mounted on a mobile hoist, one vacuum conveyor can be used flexibly to feed material into various machines, one after the other. A hoist also offers convenient access to the conveyor, easily moving it down from the machine for cleaning and maintenance. Volkmann hoists as feature no-tools assembly and dis-assembly and feature a design that avoids the tendency of similar unist to lose height overnight.