Abstract: An electrostatic fluidized bed powder coating apparatus including powder coating structure, such as a coating enclosure, hood or booth, and a powder fluidizing bed operatively associated with an electrostatic charging device. An enclosed powder accumulator is provided for collecting excess powder from the powder coating structure. A vacuum pump communicates between the powder coating structure and the powder accumulator and is operable by a source of compressed air for forming and controlling a cloud of powder emanating from the fluidizing bed and for transferring excess powder from the powder coating structure to the powder accumulator. In the preferred embodiment, the accumulator includes a cyclone housing. A powder reclaim feeder is disposed below and in communication with the cyclone housing and further communicates with a new powder feeder.

Abstract: An apparatus and a method for protecting against a person being caught in a closing automatic door provides constant force values up to the few last millimeters of a door closing movement. A regulating error or difference signal representing the difference between the desired door motor speed and the actual motor speed is generated during the door closing travel and is continuously compared with a maximum predetermined tolerance signal produced by a target value generator and a door stop with subsequent reversing is initated if the tolerance value is exceeded. A learning travel computer, during periodic learning travels, determines values for mass compensation and for friction compensation and adds these values to generate a compensation signal which is added to the difference signal as an input to a regulator for controlling the door motor through an electronic switching system.