Abstract: Apparatus for refining pulp stock which is ground in an inclined grinding zone extending from a peripherally outer portion of a pair of opposed disc members which rotate relative to one another within a housing. The pulp stock is advanced by a conveyor into a central opening between the opposed disc members, from which opening it is accelerated radially towards the grinding zone under the influence of the centrifugal force generated by the rotational movement of the disc members by means of a plurality of sector-shaped channels defined between the opposed disc members.

Abstract: A compaction apparatus for use with lawn grooming equipment such as a lawn mower, leaf blower and the like, including a compactor housing having an inlet opening at one end to receive the refuse material picked up from the lawn and a screw conveyor rotatably mounted within the housing to transport and compact the received material as it is advanced through the conveyor housing. Perforations in the housing provide outlets for evacuating from the housing, air and moisture separated from the compressed material as it is initially compacted in the housing. A flexible tubular collector casing or hose is extensibly connected to the outlet end of the compactor housing, into which the initially compacted material is continuously advanced.