Abstract: In an impact crusher for reducing the size of particulate material, the breaker bars having one or more quasi-circular depressions for engaging a circular back-up bar is secured to a rotor by means of a serrated wedge and C-clamp assembly. A newly designed housing opening permits the breaker bars to be placed in an optimum horizontal positioning and a rotor-locking assembly holds the back-up bars in this optimum positioning and provides support for the breaker bars during replacement thereof.

Abstract: A concrete press has an upper movable platen and a lower fixed platen. Hydraulic cylinders are interposed between the upper platen and frames of the press which extend horizontally over this platen. A mold shaped as a concrete building panel is filled with high water-to-cement ratio concrete and is introduced between the platens for pressing. The mold has collapsible interleaving sides. Lateral hydrostatic pressure on the short ends of the molds is resisted with hydraulic rams. Hydrostatic pressure against the long sides of the molds is resisted by hydraulically positioned wedges which are interposed between the mold sides and the frames which contain the platens and cylinders. Means which are responsive to the cylinder positions are provided for maintaining all parts of the movable platen level during the compacting process. The mold sections are prevented from collapsing inadvertently with magnet means.

Abstract: A converter vessel bottom handling device having a frame adapted to be supported on a car and which in turn supports a bilaterally movable support table. Four double acting hydraulic lift cylinders are mounted on the support table for vertically moving a lift table upon which is mounted a tilt table adapted to engage and support a converter vessel bottom. A first and second plurality of hydraulic cylinders are coupled to the tilt table for tilting the same relative to the horizontal plane and for rotating said table about a central vertical axis. A set of lugs affixed to the tilt table are provided to be keyed to mating lugs on the vessel bottom for exerting a downward breakaway force on the vessel bottom through the use of the lift cylinders when removal of the bottom becomes necessary.In an alternate embodiment, a plurality of jacks are provided on the vessel bottom for exerting a breakaway force between the vessel and vessel bottom assembly.