Abstract: A guide for a hand-manipulated power saw having a main support plate, the guide having a sole plate with a saw-guiding edge, and a gauge bar clamp on the sole plate at the bottom surface thereof at right angles to the guiding edge, the clamp having a resilient member spaced from the bottom surface of the sole piece to hold a gauge bar or rod directly against the work-piece.The invention includes two forms, one in which the clamp is integral with the sole plate and thus fixed in relation to the saw guiding edge, and a form in which the clamp is detachable and adjustable relative to the saw guiding edge, the clamp in this case being under the sole plate so that the gauge bar is also located under the sole plate in use.

Abstract: In compression systems, a portion of the compressor outlet flow (28) is extracted and introduced through a surge nozzle (52) into a plenum (48) upstream of the compressor (14). The surge nozzle (52) is oriented so as to introduce in the fluid in the plenum (48) a vortex having the same axis and direction of rotation as the compressor rotor (54).

Abstract: In an air cycle environmental control system, a condenser (46) removes water vapor from compressed, ambient, supply air (9) before it is expanded in a first turbine (24). The chilled outlet air (49) from the first turbine (24) is then used as coolant in the condenser (46), absorbing there the heat of vaporization of the condensed water vapor. After passing through the condenser (46), the warmed coolant is then expanded in a second turbine (26). Should the pressure of the supply air fall below predetermined levels, portions of the cycle that degrade performance or become unnecessary are bypassed.

Abstract: A plate fin heat exchanger is provided having: a core having a plurality of warm layers for conducting a warm fluid and a plurality of cold layers for conducting a cold fluid, the warm layers making a first pass parallel to at a front face of the exchanger, the front face being first exposed to the cold fluid, and then passing in an essentially counterflow pattern to the flow of the cold fluid through the exchanger from a back of the exchanger to near the front face thereof; and a baffle disposed at the back face of the heat exchanger, the baffle being adapted to create a high pressure profile at the front face such that the cold fluid is distributed upon the front face in such a manner that snow and ice build-up upon the front face is minimized.

Abstract: A high performance water collector (1) dries a moisture-laden airstream within a duct (7) by providing an air guide (20) with a gap (12) between a collector inlet section (4) and discharge section (6). The guide (20) defines a scupper (26) to direct the heavily moisture-laden air to a diffuser (14) surrounding the gap (12). The diffuser (14) slows the air, causing the water to fall naturally within the diffuser (14) for subsequent removal. The guide (20) further defined an ejector (28) for infusing the dried air back into the duct.

Abstract: An air cycle refrigeration system (10) pressurizes and cools flight compartment (115) and cabin (120) by the provision of chilled air thereto. Trim valves (180) and (205) set by a common actuator (195) control the mixture of uncooled system inlet air with the chilled air for individual regulation of the temperatures of the cabin and flight compartment.

Abstract: An air cycle refrigeration system (10) for cooling and ventilating an enclosure such as an aircraft cabin (15) includes a circulation heat exchanger (145) for absorbing heat from air within the cabin, a sink heat exchanger (120) for delivering the heat absorbed from the cabin air to exhaust air from the system's turbine (80) and for melting ice in the exhaust air. A heat exchange liquid circulates through both heat exchangers in a single loop (100). The circulation heat exchanger (145) may be located in the interior of the cabin (15).

Abstract: Two fluid streams of different temperatures flow through two concentric pipes, the flow of each stream being modulated to achieve a desired mixture temperature. An in-line slide valve is interposed in one fluid flow path, and an in-line poppet valve is interposed in the other fluid flow path. A thermally responsive element is positioned downstream to sense the temperature of the mixed fluid stream, the element being connected via a rod to both the slide valve and the poppet. When the mixture temperature varies from a preselected temperature, the thermally responsive element moves the rod to gradually close the slide valve and open the poppet, or gradually close the poppet and open the slide valve, thereby changing the flow of both fluid streams and maintaining the desired mixture temperature.

Abstract: A water separator consisting of a baffle and scupper is inserted inside the outlet header of a regenerative heat exchanger for removing water from the air discharged therefrom. The cooled air which contains water droplets leaving the core of the heat exchanger is passed through a baffle constructed to provide a gradual restriction in area in order to increase flow velocity. Heavy droplets of water are separated by the sudden change in airflow direction through the baffle and header. The flow including the heavier centrifuged water droplets then impinge on the inside surface of the header to which the accumulated particles of water adhere and are accelerated by the airflow and the contour of the header toward a scupper located downstream of the baffle opening. The water is collected in the scupper cavity, collected in a drain well, and drained with the assistance of gravity and the resulting pressure differential across the drain port.