Abstract: An apparatus and related kit for forming the apparatus that includes a modular perimeter guardrail assembly useful on top of electrical transformers found in industrial settings. The apparatus and kit includes a plurality of anchors, each said anchor providing a post support and removably attachable to an edge of an electrical transformer; a plurality of post assemblies, each post assembly removably attached to a corresponding one of said anchors in a vertical orientation; a plurality of brace assemblies, each brace assembly removably attached to at least two of said post assemblies; and at least one midrail clamp assembly capable of providing removable attachment to exactly two of said brace assemblies at a midpoint thereof.

Abstract: The invention is a mobile maintenance stand that combines the function of an adjustable stairway and hydraulic scissor lift that independently elevates and descends an access work platform to support maintenance tasks on commercial and military aircraft. The elevating access work platform has an extended reach of 144? and is initiated by a secondary hydraulic scissor lift that promotes upward extension beyond the parameters of the adjustable stairway reach, to provide further maintenance access. The additional extension range of the access work platform with a hydraulic scissor device, provides vertical movement to the work deck at all check levels. Further, this invention is self-contained that collapses to a compact dimension and be transported on an air cargo pallet. Thus, the invention's mechanical scheme of the scissor lift to extend access work platform beyond the adjustable stairway is novel and, is unlike any existing articulating stairway and, or scissor embodiments.

Abstract: A filter system comprises a filter unit and a cleaning unit which cleans the filter unit while the filter unit is operating normally. The filter unit is compartmentalized. During cleaning, an individual compartment is isolated between a pair of ducts of the cleaning unit and is cleaned by applying pulses of a cleaning fluid to one of the ducts and suction to the other duct. The filter unit is rotatable relative to the cleaning unit to align successive compartments of the filter unit with the cleaning unit.

Abstract: Apparatus for delivering cryogenic liquid from a supply vessel to a plurality of receiver vessels employs a subcooler that operates at atmospheric pressure. A supply hose delivers cryogenic liquid from the supply vessel to the subcooler, and coaxial hoses deliver cryogenic liquid from the subcooler to the receiver vessels. The subcooler has an inner chamber surrounded by an annular vent space. A predetermined level of cryogenic liquid is maintained in the inner chamber. Cryogenic vapor from the inner chamber continuously vents to atmosphere via the annular vent space. Cryogenic liquid from the supply hose passes through a heat exchanger in the inner chamber to an inner tube of each coaxial delivery hose, the outer tube of which has one end open to the liquid in the inner chamber and has its other end sealed. The delivery hoses are stored in an upright position, so that the inner and outer tubes thereof become filled with cryogenic vapor under pressure.