Abstract: A sound absorption device in accordance with this invention includes an enclosure loosely containing hollow beads. Preferably, the hollow beads have openings, and differ with respect to the volume of the hollow space defined by the walls of the beads, the wall thicknesses of the beads, the size of the openings of the beads and/or the number of openings on the beads. Through Helmholtz resonance, vorticity and tortuous path scattering, the beads damp sound waves over a broad range of frequencies. Preferably, the beads are formed from a material able to withstand relatively high temperatures, such as ceramic or nickel. The beads can thus be used to damp sound in applications which generate significant heat in addition to sound, such as aircraft engines, rocket motors or other loud, heat-generating sources, for example. Also, by forming the beads from a material with a relatively low thermal conductivity, the beads can also be used for thermal insulation in addition to sound absorption.
Abstract: A unitary, pressure-regulating corneal implant device for use in controlling intraocular pressure of the cornea is disclosed, the implant having a conduit with a bore and a porous core material disposed in the bore for allowing egress of aqueous humor from the anterior chamber of the eye. The conduit is elongated for extending from the ocular surface of the eye substantially flush therewith through the corneal stroma, and into the anterior chamber.
Abstract: Apparatus is disclosed for providing one hundred percent inspection of natural gas mains under operating flow conditions. The apparatus includes a scan unit assembly which is inserted into the gas main to collect data for the production of graphic images of the wall of the gas main. The scan unit includes a plurality of scan rollers, each containing an ultrasonic transducer, which traverse the surface of the wall defining the inner diameter of the gas main. The ultrasonic transducers transmit interrogating pulses into the wall of the gas main at a pre-determined spaced apart interval resulting in a helical scan pattern of interrogating pulses. The return pulses from the surfaces defining the inner diameter and outer diameter of the gas main and any imperfections and/or flaws within the wall of the main are received by the transducer and transmitted to a display unit for a visual indication (a tomograph) of the wall of the gas main.
April 5, 1994
Date of Patent:
June 24, 1997
Gas Research Institute
Karl F. Kiefer, Gerard T. Pittard, Donald L. Chaffee, C. Grissom Steele, Terry P. Clifton
Abstract: A store for work products conveyed along a storage line from an input station to an output station is disclosed. The input station and the output station of the store are constructed and arranged to be operated independently of the other. The store also has a plurality of gondolas, each gondola having a plurality of carrier plates for carrying work products thereon. A first generally circular and continuous conveyor at the input station lifts the gondolas off of the storage line, moves the gondolas through the input station for the placement of work products thereon, and then places the gondolas back onto the storage line for travel to the output station. At the output station a second generally circular and continuous output conveyor lifts the gondolas off of the storage line, moves the gondolas through the output station so that the work products may be removed therefrom, and then places the gondolas back onto the storage line.
Abstract: A first spiral-mode microstrip (SMM) antenna has an antenna element situated over and spaced from a parallel ground plane. The antenna element is a frequency-independent planar structure having a plurality of spiraling arms extending outwardly in a plane from a central portion, the arms having respective feed points to excite the spiral modes. Of particular significance, a shorting mechanism connects one or more arms to the ground plane element for influencing the shape of the electromagnetic radiation pattern. A second embodiment of the SMM antenna is constructed as the first, but has a center feed and an off-center feed, and further comprises shorting mechanisms situated well within the periphery of the antenna element. A third embodiment of the SMM antenna is constructed similar to the first, but has a concentric gap situated within the arms so that there is, in effect, a first antenna element having a first plurality of arms and a second concentric antenna element having a second plurality of arms.
Abstract: A locking mailbox (5) for receiving mail and other deliveries, to include newspapers and magazines, in a weather and theft resistant enclosure having a generally upright housing (7), a bottom compartment (8), and a separate top compartment (9), defined within the housing. An elongated mail slot (26) is closed on the bottom compartment by an elongated flap (28) through which mail and deliveries are passed into the bottom compartment. Bottom compartment (8) has a generally rectangular side opening (32) defined therein, opening (32) having a pair of parallel and spaced part recessed side edges (33) and a recessed top edge (34) for receiving lockable door (36) flush on the housing, the door being movable from an open position into a closed position locked on housing (7) for enclosing bottom compartment (8). Top compartment (9) is formed as an elongated tubular body above the bottom compartment and is completely separate from bottom compartment (8).
Abstract: A power surge protection apparatus (10) protects circuitry from electrical surges induced in an alternating current power connection to the circuity. The apparatus (10) comprises first, second, and third stages (16, 17, 18), which serve to clamp and dissipate superfluous energy, such as that from a power surge, on the power connection (12a, 12b). The first stage (16) comprises a metal oxide varistor MOV 1 and a capacitor (C1) for helping to clamp and dissipate large-duration continuous surges on the power connection (12a, 12b). The second stage comprises an RC-LC filter with resistor R1, capacitor C2, inductor L1, and capacitor C3. Moreover, the second stage (17) has a metal oxide varistor MOV 2. Importantly, the second stage (17) further comprises a bifilar transformer T1 situated between the connections (24A, 24b).
Abstract: A processing line for the defeathering of birds including a scrub washer (27) positioned upstream from the scalder (28) and picking station (29) of the processing line for precleaning the birds prior to scalding and picking the feathers from the birds. The scrub washer (27) includes a series of flexible fingers (63), which engage the bodies of the birds and ruffle the feathers of the birds to wipe dirt, loose feathers and contaminating material from the bodies of the birds. At the same time the flexible fingers tend to bear against the birds so as to urge contaminating material contained within the visceral cavities of the birds out of the visceral cavities. Spray nozzles (53) apply a fluid spray (54) to the birds to wash any loose feathers, dirt and contaminating matter from the birds. Thereafter, the precleaned birds are passed through a scalder (28) and through a picking station (29) where the feathers are moved from the birds.
Abstract: A packaging machine has a partition inserter and selecting apparatus suspended above a flow of articles. The partition inserter and selecting apparatus are mounted to an inner frame which can be raised or lowered to adjust the spacing between the partition inserter and selecting apparatus relative to the articles. In this manner, the packaging machine can package articles of different heights. The partition inserter and selecting apparatus are mounted to the inner frame on guide rails which allow a technician to move the partition inserter and selecting apparatus laterally away from the articles and over a maintenance deck so that the technician can easily perform necessary repairs or maintenance. The partition inserter and selecting apparatus are releasably engaged with each other to permit the technician to access more easily all areas of the partition inserter and selecting apparatus.
April 6, 1995
Date of Patent:
February 11, 1997
Frank Moncrief, Dwight L. Smith, David R. Bacco
Abstract: Electrostatic transducers (10, 100) for generating and/or sensing percussion waves have an internal rigid unitary element comprising an insulating sleeve (17, 117), an electrode backplate (21, 121) situated within the sleeve (17, 117), and a dielectric layer (22, 122) which secures the electrode backplate (21, 121) within the sleeve (17, 117). The dielectric layer (22, 122) is a generally continuous layer and has support fingers (24, 124) protruding outwardly away from the electrode backplate (21, 121) for supporting an electrode diaphragm (26, 126), preferably a durable metal foil. The electrode diaphragm (26, 126) may be hermetically sealed to a housing (111), which encloses the unitary element so that the transducers (10, 100) are better suited for harsh, extreme high/low temperature, and/or extreme high/low pressure environments. Furthermore, the interior region (32, 132) of the transducer (10, 100) can be evacuated via a throughway (31, 131) so that the transducer power can be increased.
Abstract: Radiant emitting walls enclose opposite sides of a central combustion chamber in an oven where coated objects to be dried are placed or passed. The radiant emitting walls generate primarily infrared radiation and have a nonuniform temperature distribution so that the temperature of the lower portion of the oven can be selectively adjusted to be significantly higher than the temperature of the upper portion. An insulated outer housing surrounds the radiant walls and defines combustion chambers each having a linear burner which runs substantially the entire length of the radiant emitting walls. The lower portions of the radiant emitting walls receive energy primarily from radiation from the linear burners and the upper portions of the radiant emitting walls receive energy from primarily radiation from the interior radiant emitting surfaces of the insulated outer housing and convection from the linear burners.
Abstract: An intubation tube stylet (10) is slidably received within an intubation tube (14). The stylet (10) comprises a handle (34), a flexible tube (24) and a performed tip (18) affixed to the flexible tube (24) such that the tip (18) extends beyond an insertion end (28) of the intubation tube (14). The flexible tip (18) comprises a general Z-Shape designed to facilitate insertion into the larynx and vocal cords of a patient regardless of any obstructing physical characteristics. Once the tip (18) is within the larynx, a plunger and cap (32), which is interconnected to a rod (30) through the handle (34), is activated to straighten the tip (18) allowing the intubation tube (14) to slide there along into the larynx. After the intubation tube (14) is within the larnx, the stylet (10) is removed to allow use of the intubation tube (14). The stylet (10) also provides for suction of the airway during insertion of the intubation tube (14) without the necessity of looking away from the insertion.