Abstract: A device for working a surface, especially a lifting platform, includes boom or a platform, a working means, which can be placed against the surface to be worked, and a means which is arranged between the boom or the platform and the working means and which provides an application force that acts on the working means. The working means is suspended on a suspension such that it can move freely around two axes, which preferably form a right angle. The means which provides the application force engages with the suspension.

Abstract: This disclosure relates to an automatically controlled scraper for moving particulate material onto a radial or star feeder for distribution thereby. The scraper includes a scraper bucket suspended from a radially extending arm. The bucket is connected to both a digging cable line and a lifting cable line, each of which is in turn connected to a suitable winch. The winches are controlled by clutches and brakes, each of which are optionally activated by interconnected automatic and manual control elements, whereby operation may be selectively changed from automatic to manual at the discretion of the operator.

Abstract: This disclosure relates to an automatically controlled scraper for moving particulate material onto a radial or star feeder for distribution thereby. The scraper includes a scraper bucket suspended from a radially extending arm. The bucket is connected to both a digging cable line and a lifting cable line, each of which is in turn connected to a suitable winch. The winches are controlled by clutches and brakes, each of which are optionally activated by interconnected automatic and manual control elements, whereby operation may be selectively changed from automatic to manual at the discretion of the operator.