Abstract: A motorized, two-wheeled retrofit assembly converts a portable, four-wheeled transport unit, such as a scaffold, to a self-propelled, power driven unit for directional movement from one location to another. The retrofit assembly is attached to the transport unit in a manner that immobilizes or replaces the front wheels of the transport unit. The retrofit assembly comprises a drive assembly and a steering assembly. The drive assembly includes a pair of freely rotating wheels that are spaced apart from each other and share a common axle. Each freely rotating wheel is disposed adjacent to and detachably engaged with a corresponding slip drive wheel that is fixed to the axle for driving the freely rotating wheels. The drive assembly further comprises a motor; a drive mechanism that operatively interconnects the motor with one of the slip drive wheels for turning the retrofit assembly axle; a power source for the motor; and a base communicating with the axle for carrying the assembly motor and power source.

Abstract: A packaging machine includes a grouper section having changeable lane sizes and a dual servo grouper that separates product into product sets and allow the product sets to accelerate to the lane chain speed in a controlled manner. The grouper section further includes disappearing lugs that pivot into the lanes via a cam surface provided in the lanes. The product rides upon a raised surface of the cam surface as the lug pushes the product set together down the lane, thus ensuring that no gaps are provided between product set members. A gripper/grid section of the packaging machine includes a bars that travel about a carousel with a gripper head assembly and a grid assembly pair moving up and down the bars as defined by cam surfaces within the gripper/grid section. The grid section is presented below the product set such that the product set is fed through the grid section in a one-way trip into a case. The gripper head assembly cam device and the case feed section both include height adjustment assemblies.