Abstract: A floor treatment assembly may include drive block and a plurality of floor abrasion assemblies. The drive block includes a top side and a bottom side, the plurality of floor abrasion assemblies are coupled to the bottom side of the drive block. Each of the floor abrasion assemblies includes a nest movably coupled to the drive block, and an abrasion feature mounted to the nest such that the abrasion feature and the nest are operable to move relative to the drive block. In embodiments, each of floor abrasion assemblies includes a support plate mounted to the drive block, with the nest and the abrasion feature being movable relative to the support plate. The abrasion feature may be a grinding wheel or filament (or tufts of filament) supported by the nest.

Abstract: A torsion device for facilitating opening and closing a gate attached to a support. The device broadly includes a first section, a second section, and a coupling section. The second section includes an angled portion and a contact portion. The angled portion is operable to be substantially inserted into the gate such that the contact portion generally abuts an interior surface of the gate when the gate is substantially opened. The coupling section couples the first section and the second section such that opening of the gate causes a torsional force to be applied by the device to facilitate opening and closing of the gate. The abutting of the contact portion improves functionality and reduces damage to the gate caused by the torsional force.