Abstract: An apparatus includes a support surface and a moving mechanism for automatically varying the orientation of the support surface in a predetermined manner over time to reduce or eliminate the likelihood of repetitive stress injury as a result of performing repetitive tasks on or otherwise using the support surface. By varying the orientation of the support surface, e.g., by moving and/or rotating the support surface over time, repetitive tasks performed on the support surface are modified at least subtly to reduce the repetitiveness of the individual motions performed by an operator.

Abstract: A thrust bearing for bearing a load along a force vector includes at least two roller elements in rolling contact with one another and arranged along the force vector such that the load is borne through the roller elements. The roller elements are retained within a retainer such that they remain aligned along the force vector while subjected to loads. The retainer used to house the roller elements may be designed to abut the roller elements at minimum points of contact, or alternatively to distribute the load borne by one or both of the roller elements across a greater surface area. One application of the preferred thrust bearings is in an apparatus such as a keyboard support for reducing repetitive stress injuries. A main disk is rotatably coupled to a base and supports a support member on a plurality of the thrust bearings.

Abstract: A thrust bearing for bearing a load along a force vector includes at least two roller elements in rolling contact with one another and arranged along the force vector such that the load is borne through the roller elements. The roller elements are retained within a retainer such that they remain aligned along the force vector while subjected to loads. The retainer used to house the roller elements may be designed to abut the roller elements at minimum points of contact, or alternatively to distribute the load borne by one or both of the roller elements across a greater surface area. One application of the preferred thrust bearings is in an apparatus such as a keyboard support for reducing repetitive stress injuries. A main disk is rotatably coupled to a base and supports a support member on a plurality of the thrust bearings.

Abstract: A door apparatus (10) is disclosed. The door apparatus (10) includes means for connecting to a door frame (20) of a building (11) suitable for housing a truck body assembly, e.g., a semi-trailer (13). The semi-trailer (13) includes a body (15) supported by wheels. The door apparatus (10) obstructs the space between the truck body (15) and the door frame (20) of the building, thereby permitting the truck body (15) to extend through the doorway while maintaining a weather-resistant and secure enclosure. In a preferred embodiment the door apparatus (10) includes left and right sections, (18) and (14) respectively, that are vertically hingedly connected to the door frame (20); an upper section (12) that is horizontally hinged to the door frame (20); and a lower section (16) that is vertically hinged to sections (18) and (14). Resilient body surface flaps (34) connected to the inner edges of the door sections (14), (18), ( 12) and (16) provide weather resistance and adaptability to truck bodies of varying sizes.