Abstract: A mine roof bolt assembly including a roof bolt, one end of which has rolled threads, leaving the outer periphery of the end of the roof bolt jagged, and the central portion thereof of concave configuration. An expansion shell is mounted on the roof bolt and includes expandable leaves held together by means which permit limited radially outward movement under urging of a wedge member threadedly engaged with the roof bolt. A stop tab carried by the expansion shell limits the penetration of the roof bolt into the expansion shell. The stop tab is provided with a downwardly struck indentation which engages the concave portion of the roof bolt, the stop tab being spaced from the jagged peripheral edge of the roof bolt.

Abstract: This invention is a trash compactor for compressing trash as it is moved in a horizontal direction. The compactor includes an elongated chamber comprising a rectilinear section into which the trash is placed, a power member for forcing the trash through the rectilinear section, where the trash is initially compacted and, a curvilinear section through which the trash is pushed by the movement of trash through the rectilinear section. The curvilinear section is of sinuous or S-shape configuration and is preferably disposed in a vertical plane. Frictional engagement of the trash with the walls of the curvilinear section effects substantial compaction of the trash prior to emission for disposal. The curvilinear section includes at least two curved parts which are pivotally connected together and pivotally engaged with the rectilinear portion for varying the angularity of the curvilinear section to control the compression of the trash forced therethrough.