Abstract: A clamping apparatus is provided with a shoe mountable on a work surface, and a clamp having a foot adapted for removable engagement with the shoe. Also provided is a method of clamping a workpiece in a fixed location with respect to a work surface including mounting a shoe on the work surface, providing a clamp with a foot and a clamping head, where the foot is adapted for removable engagement with the shoe, engaging the shoe and the foot, and clamping the workpiece between the clamping head and the work surface.

Abstract: A thermal stairway cover is disclosed for insulating a stairway opening containing a pull-down, ceiling stairway leading to an attic. A plate is movable between a first position which closes the cover and reduces heat transfer therethrough and a second position where the cover is open to provide access through the stairway opening to the attic.

Abstract: A disposal chute for waste paper, cardboard, and other packing materials is disclosed which is intended to temporarily connect a container to a building. The disposal chute is permanently positioned adjacent to the building. A slip joint construction connects the chute to the building in such a manner as to completely enclose the mating surfaces while allowing relative movement between the chute and the building. The mating surface at the building is designed so that the relative movement does not adversely affect the brick and mortar construction of the building surrounding the opening for the chute. A container, which may be removed and replaced relatively often, is positioned adjacent to the chute to be in communication with the building. The placing and removing of the container results in the relative movement between the chute and the building.