Data Products Corporation

Creare, Incorporated

John A McCormick

Thomas W DeYoung

Javier A Valenzuela

Stuart D Howkins

Herbert Sixsmith

Lisa M Schmidle

A jack and dolly assembly provides for easy, efficient, and effective transportation and installation of heavy items such as a door, a panel, and the like. The assembly is adapted to provide the ability for one person to quickly, easily, efficiently, and effectively load, install hardware upon, store, transport, lift, position, uninstall, and/or install an object. The assembly is adapted to include adjustable components such that the assembly can accommodate different sizes of objects. According to some embodiments, the assembly includes a frame, carrying arm, and securing mechanism for holding/securing the object, and a pair of large wheels for easily transporting the object. The assembly is further adapted to provide the ability to lift an object and properly hold the object in place during installation.

Heavy-duty door jack and dolly

A three-phase inverter for small, high speed motors such as a miniature centrifical compressor which has a low voltage, high current requirement. The inverter is supplied with DC power at 28 volts, and produces power of about 50 to 500 watts at about 15 volts, and at frequencies of about 5 to 9 kilohertz. Six D-type flip-flops with clock inputs produce twelve signals which are provided to six bridge drivers. Each bridge driver controls two MOSFET's in series. The MOSFET's are supplied with DC power. Outputs are fed to primaries of adjacent transformers in a circular array. The transformer secondaries are arranged in a star configuration to produce stepped voltage and saw-tooth current output wave forms approximating sinusoids in three phases.

Three-phase inverter for small high speed motors

A radial position sensor includes four capacitive electrodes oriented about a shaft, arranged in two diametrically opposite pairs. Sensor circuitry generates an output signal in proportion to the capacitance between the electrodes and the shaft; the capacitance between an electrode and the shaft increases as the shaft approaches the electrode and decreases as the shaft recedes from the electrode. The sensor circuitry applies an alternating voltage to one electrode of a pair and a 180 degree out of phase alternating voltage to the other electrode of the pair. The electrical responses of the two electrodes to their respective input signals are summed to form a radial deviation signal which is relatively free from the alternating voltage and accurately represents the position of the shaft relative to the electrodes of the pair.

Radial displacement sensor for non-contact bearings

An ink jet apparatus having a scanning head employing at least one ink jet with a variable volume chamber which includes an ink droplet ejecting orifice, and a transducer, having a length mode resonant frequency, adapted to expand and contract along an axis of elongation in response to an electric field substantially transverse to the axis of elongation for ejection of droplets on demand from the ink droplet ejecting orifice is acoustically microstreamed by exciting the transducers during non-printing periods to eliminate start-up problems and to maintain pigments or other particles in dispersion within the ink.

Acoustic microstreaming in an ink jet apparatus

An ink jet apparatus has a manifold and a feed tube of substantially the same cross-sectional areas as the manifold, thereby connecting the manifold with an ink reservoir so as to effectively present the large compliance characteristic of the reservoir at the manifold, and enabling a reduced volume print head construction which efficiently reduces cross talk and vibrational problems.

Ink jet head with low compliance manifold/reservoir configuration

A method and apparatus for supplying ink to an array of ink jets is provided by two fluidically independent reservoirs, each reservoir supplying ink to a respective end of a manifold which communicates with the array of ink jets via their inlet restrictors. During normal operations involving an acceleration of the array along a scanning path, the ink levels in the two reservoirs will remain the same since any difference in their levels will create a pressure differential that drives a flow of ink through the manifold from the higher level reservoir until such time that their levels equalize.

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Norwich, VT, United States of America

John A McCormick