Abstract: A height adjustable work surface is described that may be utilized as a standalone desk or table, or integrated with a larger work surface to provide selective height adjustability to only a portion of a work surface. The height adjustable work surface preferably utilizes a modular trapezoidal frame structure, including trapezoid tube weldments, corner castings and machined hardened connector pins. The lift mechanism preferably includes parallelogram linkages, pneumatic gas cylinders, sliding brake bar mechanism and brake release handles to provide height adjustment functionality.

Abstract: A tabletop positioning and locking assembly is described for use with a modular trapezoidal table frame structure that utilizes trapezoid tube weldments. The positioning and locking assembly automatically positions the tabletop on the trapezoidal table frame at the exact desired location in relation to the frame, and also securely locks the tabletop down onto the table frame without the need for hardware or tools.