Abstract:
A helical-element antenna as part of a communication system is mechanically steered with reference to an azimuth axis and an elevation axis within a positioning envelope greater than hemispherical. The system for mechanically steering the helical antenna includes a supporting frame having an azimuth member with a longitudinal axis coinciding with the azimuth axis around which the antenna rotates. Further, the supporting frame includes an elevation member that is integral with the azimuth member and has a longitudinal axis displaced from the azimuth axis. An interface fitting rotatably mounts the antenna to the elevation member. The supporting frame is rotatably mounted to a pedestal base that has a plane perpendicular to the azimuth axis. To position the antenna about the azimuth axis, an azimuth steering unit is energized to rotate the supporting frame 360 degrees around the azimuth axis. For positioning the antenna about the elevation axis, an elevation steering unit rotates the interface fitting and the antenna through a gear coupling about the elevation axis. The total rotation excursion about the elevation axis is typically 180 degrees and points the antenna through a range of elevation angles.
Abstract:
A lighted sign or lighting fixture includes a housing that contains a series of LEDs. The housing has a pair of side walls and a series of spaced apart reinforcing members that extend between and interconnect the side walls. The reinforcing members may be formed integrally with the side walls, or may be in the form of separate members that are securely attached to the side walls. An LED mounting structure, such as a PCB, may be attached to the reinforcing members, or alternatively a separate bottom wall may be secured to the reinforcing members.
Abstract:
A lighting arrangement using LEDs that has an elongated translucent diffuser having a flat upper surface along the length of the diffuser. The transverse cross-section of the elongate translucent diffuser may have various shapes, all having substantially flat tops, including but not limited to quadrangular, rectangular, trapezoidal, and non-isosceles variations of these shapes. The elongated translucent diffuser is mounted on an elongated housing of substantially the same length to support the diffuser. The elongated housing may be solid or hollow and may contain the LEDs and circuit board, or the LEDs and circuit board may be contained within the elongated translucent diffuser. The LEDs are configured to transmit light through the diffuser so that the emitted light simulates light from a traditional neon tube.
Abstract:
A buoy is provided with first and second fixed hydrodynamic surfaces (15,16). When the buoy is towed through water by a tether (17), the first hydrodynamic surface (15) generates a downward force that reduces with increased speed through the water. The second hydrodynamic surface (16) generates an upward force that increases with increased speed through the water so that the buoy dives up to an upper critical speed through the water speed and rises beyond said upper critical speed through the water. The downward force of the first hydrodynamic surface (15) overcomes the buoyancy of the buoy at a lower critical speed through the water above, which the buoy dives. The hydrodynamic surface (15) comprises first fins (15) mounted on an outer casing (1) of the buoy and are spaced angularity and extend parallel to the center axis of the buoy which is substantially aligned with the direction of towing. The second hydrodynamic surface (16) comprises second fins (16) mounted on the outer casing arranged upstream of the first fins (15) in the direction of towing. The second hydrodynamic surface (16) is set at an angle of incidence such that it creates a stalled flow condition at said upper critical speed through the water.
Abstract:
A buoy is provided with first and second fixed hydrodynamic surfaces (15,16). When the buoy is towed through water by a tether (17), the first hydrodynamic surface (15) generates a downward force that reduces with increased speed through the water. The second hydrodynamic surface (16) generates an upward force that increases with increased speed through the water so that the buoy dives up to an upper critical speed through the water speed and rises beyond said upper critical speed through the water. The downward force of the first hydrodynamic surface (15) overcomes the buoyancy of the buoy at a lower critical speed through the water above, which the buoy dives. The hydrodynamic surface (15) comprises first fins (15) mounted on an outer casing (1) of the buoy and are spaced angularity and extend parallel to the centre axis of the buoy which is substantially aligned with the direction of towing. The second hydrodynamic surface (16) comprises second fins (16) mounted on the outer casing arranged upstream of the first fins (15) in the direction of towing. The second hydrodynamic surface (16) is set at an angle of incidence such that it creates a stalled flow condition at said upper critical speed through the water.
Abstract:
A boot, such as a snowboard boot, having an outer shell including a flexible upper and a harness assembly disposed in the outer shell. The harness assembly wraps about a user's ankle, includes a plurality of cord keepers. A cord—for example, a lace or a stainless steel cable—slidably engages the cord keepers, for tightening the harness about the user's ankle. A tensioning mechanism such as a spool mechanism or a lace keeper is attached to the flexible upper and engages the cord, such that the user can releasably tension the cord. The cord extends through an aperture in the outer shell whereby the user can tighten or loosen the harness without removing the boot. In an embodiment, the tensioning mechanism is a lace locker fixedly attached to the shell tongue, wherein the tongue includes apertures disposed near the bottom of the lace locker to slidably accommodate the cord.
Abstract:
A gas flow regulator comprises a gas passage duct that can be axially repositioned and rotationally reoriented relative to a chamber wall for controlling the flow rate of gas from one side of the wall into an interior volume on an opposite side of the wall.
Abstract:
A radial flow fluidized unit (RFFU) (250) employing non-bonded media particles (56) for removing impurities from an influent, that can be backwashed and/or regenerated by fluidizing the media particles (56) to free the impurities therefrom. During a fluidization operation a fluid applies a drag force on a section of the media particles (56) within a volume of the unit where the media co-acts with the influent: (Volume 1). The drag force transports the media particles (56) into a second volume (Volume 2) for fluidization. Under normal conditions the top portion of the unit contains the packed media (56) where the influent co-acts with the media (56) (Volume 1). The RFFU (250) can also operate in the reverse where the bottom or opposite end contains the packed media (56) for co-acting with the influent. In either case, the opposite end of the unit (Volume 2), is used to fluidize the media (56) and thereby purge any entrapped material within the media (56) and restore the capabilities of the media for the intended purpose. Once the restoration is complete, the media (56) is hydraulically transported back to the co-acting volume (Volume 1), using the available fluids within the unit.
Abstract:
A solar power satellite (30) includes a truss structure (32) having a plurality of independently controlled solar power modules (34) mounted to one face of the truss structure. The solar power satellite is constructed in orbit by first forming and then assemblying component beam members (50, 52) to the truss structure. The solar power modules (34) are constructed on a fabrication and assembly station (36) movably attached to the truss structure and are then attached to the truss structure. The solar power modules (34) include a primary reflector (200) having a substantially parabolic curvature in cross section. A collector-radiator (202) is mounted on the primary axis of the primary reflector. The cross-sectional configuration of the collector-radiator (202) approximates a flattened inverted S-shape whereon the radius of curvature decreases as the curve approaches both its center and its end furthermost from the primary reflector (200). The primary reflector (200) is contoured to reflect sun light onto the collector-radiator structure (202). The collector-radiator structure includes a plurality of spaced radiant energy converting cells (450 ). A plurality of light reflective fins (452) are positioned between the converter cells. Each fin is thermally and electrically connected to converter cells on each side thereof. The fins provide radiant cooling of and series electrical connection between the converter cells. The fins also serve as a secondary reflector for concentrating sun light from the primary reflector onto the converter cells.
Abstract:
A spray device for cleaning residue from a filter member. In one embodiment, the spray device includes a tubular stem telescopically slideable in a sleeve. A coil spring surrounds the stem and resists movement of the stem out of the sleeve. A tubular halo with nozzles is fastened to the end of the tubular stem so that when a pressurized fluid is applied to the stem, the stem is forced out of the sleeve against the spring force, thereby causing the halo to travel along a cylindrical filter surface. The pressurized fluid is also jetted from the nozzles and cleans the cylindrical surface. When the pressurized fluid is removed from the spray device, the spring retracts the stem and the halo back to a rest position. In another embodiment, the halo is replaced with a nozzle head that moves within a cylindrical filter surface to be cleaned.