Abstract: Antenna embodiments are illustrated that are particularly suited for use in aircraft navigation, identification and collision avoidance systems. An exemplary antenna embodiment operates about a center wavelength and in association with a ground plane and comprises first and second grounded, shortened, and top loaded monopoles. These monopoles are spaced apart above a ground plane and each of them includes a feed post, a shorted post, and a top load wherein the shorted post is spaced from the feed post, is coupled to the ground plane, and has a length less than one fourth of the center wavelength. In addition, the top load is coupled to the feed post and the shorted post and is configured along orthogonal minor and major axes of the top load to have a width along the minor axis and a length along the major axis that exceeds the width.

Abstract: Antenna embodiments are illustrated that are particularly suited for use in aircraft navigation, identification and collision avoidance systems. An exemplary antenna embodiment operates about a center wavelength and in association with a ground plane and comprises first and second grounded, shortened, and top loaded monopoles. These monopoles are spaced apart above a ground plane and each of them includes a feed post, a shorted post, and a top load wherein the shorted post is spaced from the feed post, is coupled to the ground plane, and has a length less than one fourth of the center wavelength. In addition, the top load is coupled to the feed post and the shorted post and is configured along orthogonal minor and major axes of the top load to have a width along the minor axis and a length along the major axis that exceeds the width.

Abstract: An air-powered web slasher features a cylindrical housing having an interior chamber and a sidewall with a spiral groove machined into it. A piston slides within the interior chamber and has a slasher needle attached to it. The slasher needle protrudes through the spiral groove. A housing cap covers one end of the housing and pressurized air is supplied to the portion of the interior chamber between the housing cap and the piston so that the piston travels away from the housing cap. As a result, the needle travels along the spiral groove and thus up into and through a web of material, such as paper, to create a slash in the cross-machine direction. A turnup blow pipe provides air to the slasher. In addition, slits in the turnup blow pipe direct streams of air against the web in proximity to the slash so that the web is severed. The air streams then blow the newly severed end of the web onto an empty rotating spool.

Abstract: A sensor for sensing the quantity of refrigerant in a closed loop refrigeration system, with the sensor having attachment means on a lower portion thereof such that it may be installed in direct communication with the refrigerant line of the refrigeration system. The sensor has a hollow interior portion defined by generally cylindrical sidewalls, in which interior portion a float of conductive material is disposed, with the float being free to rise on the surface of liquid refrigerant entering the interior of the sensor from the refrigerant line. At least one electrode is disposed in the interior of said sensor, in a position such that it will be contacted by the float at the time a certain refrigerant level is reached in the interior of the sensor.

Abstract: A children'expandable, accordian-type gate is disclosed which includes safety features for closing off the open, upper V-shaped openings of the latticework of the gate, which latticework is comprised of a first series of slats parallel to each, and a second series of salts parallel to each other but angularly oriented differently from the first series. The upper V-shaped openings are closed off by upper extensions of the slats forming the boundaries of the V-shaped openings, which extensions project above the two, mutually-pivoted upper slat-ends from two adjacent V-shaped openings.

Abstract: A snow ski apparatus has an occupant-supporting board, a forward runner with a running surface wider in its forward portion than its rear portion and a rear runner with a running surface narrower in its forward portion than in its rear portion. An axle pivotally connected to the board extends through flanges which lie longitudinally along the sides of the runners. Elastic tension means are connected to the runners to bias the runners toward longitudinal alignment with the board.A runner has an undersurface which intersects an inclined surface at an acute angle to form a biting edge to reduce lateral slippage when making a turn.The runners are molded with upstanding side flanges, and portions of such flanges are removed to modify the flex characteristics of the runner body.