Pennsylvania Crusher Corporation

Anthony W Slikas

Carl R Graf

Joseph P Nigro

Harry E Janes

A ring hammer (10) is disclosed for use in material reduction apparatus such as a coal granulator, the ring hammer including a substantially circular body (12) having a plurality of circumferentially spaced radially projecting teeth (22) joined by a corresponding plurality of connecting segments (30). The teeth and connecting segments taper inwardly (26, 32) from their outermost surfaces (24, 34) toward the axial ends (28) of the hammer, the taper of the connecting segments being significantly larger than that of the teeth. This geometry facilitates manufacture of the hammer by forging and insures the presence of tooth-like projections on the hammer even when the outer surfaces of the teeth have worn down to the level of the connecting segments.

Ring hammer

A material reducer for coal, lignite, ore, stone, rock, oil shale and the like which employs rotary hammers, bars or the like not only to crush the material but also to propel the crushed material upwardly along a confined or partially confined path or discharge chute which empties onto an output conveyor, a screen or other processing equipment. The chute is provided with means to reduce or eliminate clogging at the discharge port from the reducer. The input end of the reducer can be at a level sufficiently low to be supplied by mobile loading units such as front-end loaders, over-the-head loaders, and others. The center of gravity can also be substantially lowered, providing more stability without the normal cumbersome frame and support structure. Reducers constructed in accordance with the invention can be made far lighter and more mobile than existing mobile reducers with the same capacity, and therefore provide a practical way of eliminating the use of trucks, with their attendant noise, dust and pollution, to haul uncrushed minerals from the bottom of a mine or quarry to a stationary crusher at the surface.

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Norristown, PA, United States of America

Anthony W Slikas