Abstract: A packing frame structure is constructed to include two top rails and two bottom rails adapted for fastening to material elements at four sides to hold material elements a row and to protect packed material elements against shocks and impact, and two blocks adapted for fastening to the bottom rails at the bottom side to support the packing frame structure and the packed material elements above a flat surface for enabling the package to be conveniently carried by a forklift. The top rails each have a top wall and through holes in the top wall for the hooking of the hook of a truck crane or the like.

Abstract: The invention relates to a roller conveyer that includes a power rack, a motor drive mounted in the power rack, and two track and roller units bilaterally mounted on the power rack. The track and roller unit includes a track, spaced roller assemblies mounted on the track, and a chain driven by the motor drive to turn the roller assemblies for carrying things forward thereon. The roller assembly includes two symmetrical hollow holder frames, two axle bearings respectively mounted in the axial holes of the hollow holder frames, an axle supported by the axle bearings and freely rotatable relative to the hollow holder frames. A bushing with a collar and a chain wheel is sleeved onto the axle, and the chain wheel meshes with the chain. A roller mounted around the bushing and turning with the bushing to carry things forward thereon.