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A method of swing on a swing is disclosed, in which a user positioned on a standard swing suspended by two chains from a substantially horizontal tree branch induces side to side motion by pulling alternately on one chain and then the other.
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| Number | Title | Issue Date |
| 7437877 | Compressor having low-pressure and high-pressure compressor operating at optimum ratio between pressure ratios thereof and gas turbine engine adopting the same A compressor having a front fan, which rotates to compress intake air, a single-stage low-pressure compressor which is disposed behind the front fan to compress intake air, and a single-stage high-pressure compressor which compresses the compressed air compressed by... | 10/21/2008 |
| 7435048 | Drain pump, and air conditioner provided therewith A drain pump is provided that reduces the operating noise when the head is low. The drain pump has a pump casing, and an impeller. The pump casing has a drain inlet for sucking in drain water at a lower end part and a drain outlet for discharging drain water at a si... | 10/14/2008 |
| 7419354 | Centrifugal pump with screw pump accelerator Method and apparatus for pumping drilling fluid (mud) containing drill cuttings, comprising a centrifugal pump with screw pump accelerator. The screw pump creating positive pressure for centrifugal pump inlet to increase performance. The screw pump mud level fluctua... | 09/02/2008 |
| 7351031 | Centrifugal blower A centrifugal blower includes a housing, an impeller, and a guiding cover. The housing includes a compartment delimited by an annular wall. A radial air inlet is defined in the annular wall and communicated with the compartment. The compartment includes an axial ope... | 04/01/2008 |
| 7326037 | Centrifugal pumps having non-axisymmetric flow passage contours, and methods of making and using same Centrifugal pumps and methods of making and using them are disclosed. One inventive pump includes a plurality of flow passages, at least one pump component having one or more non-axisymmetric flow passage contours defined at least in part by non-equal blade or vane ... | 02/05/2008 |
| 7267526 | Heat-dissipating device A heat-dissipating device includes a housing having an air inlet and an air outlet, and a blade structure disposed in the housing and having a hub and a plurality of rotor blades. The housing has an inwardly extending sidewall to define an accelerating airflow passa... | 09/11/2007 |
| 7241110 | Centrifugal fan with stator blades A centrifugal fan with stator blades. The centrifugal fan includes a first frame, a second frame, a driving device, and a blade structure with a first portion and a second portion. The second frame includes a plurality of stator blades thereon. The first portion is ... | 07/10/2007 |
| 7192254 | Radial fan having axial fan blade configuration The present invention is a radial fan having an axial fan blade configuration. The present invention comprises a hub; a first set of blades around the hub; and a second set of blades on the extending part. Therein, the hub comprises a hollow at the center, an axle, ... | 03/20/2007 |
| 7160081 | Vacuum pump A vacuum pump of the invention comprises, in a common pump body (100): molecular drag pump stages (5) in series with regenerative pump stages (9). The molecular drag pump stages (5) comprise a molecular drag rotor (5a) inclu... | 01/09/2007 |
| 7150600 | Downhole turbomachines for handling two-phase flow Disclosed is a submersible pump assembly for handling two-phase flow. The pump assembly preferably includes a housing and a first stage. The first stage includes an impeller assembly and a diffuser assembly, which are collectively configured to produce a diagonal fl... | 12/19/2006 |
| 7134839 | Radial-flow heat-dissipating fan with increased inlet airflow A radial-flow heat-dissipating fan includes a casing and a cover mounted to a side of the casing. The casing includes a compartment and a side air outlet, and the cover includes an air inlet. A primary fan wheel is rotatably mounted in the compartment and the primar... | 11/14/2006 |
| 7029233 | Modulator water dynamometer A modular waterbrake that can be used with differing types and sizes of rotating machines includes common end stages, and a plurality of common intervening power stages. Each power stage will extract a certain amount of shaft horsepower from the machine under test, ... | 04/18/2006 |
| 6960061 | Rotary pump with vented pump chamber A rotary pump includes a pump chamber disposed above a liquid basin, and a radial impeller with a vertical axis disposed in the pump chamber. An intake connecting piece is disposed coaxially with the impeller and is positioned in the liquid basin. Either an inner pa... | 11/01/2005 |
| 6619910 | Froth pumps An impeller suitable for use in a centrifugal pump, the pump including a pump chamber and a pump inlet. The impeller includes a main body portion which includes a plurality of primary pumping blades or vanes and one or more flow inducing blades or vanes w... | 09/16/2003 |
| 6547514 | Technique for producing a high gas-to-liquid ratio fluid A technique for facilitating the movement of multi-phase fluids. The technique utilizes a compressor pump and a production pump. The compressor pump compresses a fluid to remove vapor phase and then discharges the pressurized fluid to a production pump. T... | 04/15/2003 |
| 6508618 | Pump having dynamic shaft seal A pump has a housing defining a pump chamber and having a shaft opening. An impeller shaft extends through the shaft opening and is sized to define a gap between the impeller shaft and the shaft opening. An impeller is attached to the shaft inside the pum... | 01/21/2003 |
| 6488469 | Mixed flow and centrifugal compressor for gas turbine engine A two stage compressor for a gas turbine engine with a mixed flow first stage, a centrifugal second stage, and an intermediate duct. The mixed flow stage has a mixed rotor rotatable about the central compressor axis with a circumferential array of mixed f... | 12/03/2002 |
| 6447245 | Rotodynamic pump A rotodynamic pump comprising a centrifugal impeller (11) provided within a volute body (7) and an emulsifier (17) provided in the region of an inlet of the volute body and rotatable with the centrifugal impeller for emulsifying material to be pumped.... | 09/10/2002 |
| 6409468 | Turbo-molecular pump A compact turbo-molecular pump has a relatively short axial length and yet provides sufficient evacuation and compression capabilities. The turbo-molecular pump comprises a casing (10) which contains an exhaust vane section (L1) having rotary vanes (30) o... | 06/25/2002 |
| 6386839 | High performance radiator fan A high performance radiator fan includes an axial fan and a centrifugal fan. The axial fan has a plurality of arched-shaped blades located between a protrusive circular hub and a closed motor shell for drawing airflow from the upper end of the axial fan t... | 05/14/2002 |
| 6241470 | Rotodynamic pump A rotodynamic pump comprises a centrifugal impeller (11) provided within a volute body (7) and an emulsifier (17) provided in the region of an inlet of the volute body and rotatable with the centrifugal impeller for emulsifying material to be pumped.... | 06/05/2001 |
| 5961282 | Axial-flow and centrifugal pumping system A system for compressing a multi-phase fluid made up of at least one gaseous phase and at least one liquid phase, the system having at least one pair of pumping elements. The system includes an axial-flow pump P1 and a centrifugal pump P2 arranged after t... | 10/05/1999 |
| 5961283 | Drainage pump with noise and vibration reducing features A drainage pump has a pump body, a vane, a ring, and a circumferential wall. The pump has a cylindrical small vane pump chamber and a large vane pump chamber extending from and communicating with the small vane pump chamber. A suction inlet communicates w... | 10/05/1999 |
| 5788457 | Drainage pump with a wall member connecting the outer edges of the radial blades A pump body 10 of a drainage pump 1A comprises a pump chamber 12, inlet 15, and outlet 17. A rotary vane 300 mounted in the pump body 10 is coupled to a motor mounted above the pump body 10, and comprises a shaft 310 and four large-radial blades 320. Form... | 08/04/1998 |
| 5782605 | Impeller for separating a conveyed stream of material An impeller is for separating a conveyed stream of material. The impeller has a central rotatable hub with a plurality of blades extending radially therefrom. The hub and blades form a number of generally wedge-shaped material receiving spaces within the ... | 07/21/1998 |
| 5626459 | Unitary turbine/compressor engine A work reducing composite engine system that uses ambient air for a primary energy source. The device consists of a unitary turbine/compressor assembly utilizing a turbine for producing work output and a downstream compressor for receiving fluid exhaust o... | 05/06/1997 |
| 5547341 | Device for thermal transfer using air as the working medium A heating and cooling device (10) generates a thermal difference using air and includes an impeller assembly (40) having a plurality of radial compartments (45), a channel (76) for air inlet, and an air outlet (56). Air drawn in through inlet channel (76)... | 08/20/1996 |
| 5032056 | Fluid compressor A fluid compressor comprises a casing containing liquid and having located within it a shaft driven radial impeller for pressurizing the liquid before it is fed to a further rotatable structure. By rotation of the impeller and the further rotatable struct... | 07/16/1991 |
| 4838759 | Cavitation-resistant inducer An improvement in an inducer for a pump wherein the inducer includes a hub, a plurality of radially extending substantially helical blades and a wall member extending about and encompassing an outer periphery of the blades. The improvement comprises formi... | 06/13/1989 |
| 4776756 | Pump A pump for pumping liquids includes a casing formed by upper and lower casing parts secured together. The upper casing part houses a centrifugal rotor having blades which direct liquid to a volute and the lower casing part houses an axial lift impellor wh... | 10/11/1988 |
| 4693669 | Supercharger for automobile engines A supercharger for delivering supercharged air to an engine, comprising a shrouded axial compressor, a radial compressor which is located downstream of the axial compressor and a housing. The housing comprising four sections, including a section defining ... | 09/15/1987 |
| 4653976 | Method of compressing a fluid flow in a multi stage centrifugal impeller A multistage centrifugal impeller in which each blade row is individually matched to optimum efficiency characteristics in a manner which minimizes blade lean. Each blade row is composed of twisted blades which substantially equalize working fluid diffusi... | 03/31/1987 |
| 4637779 | Two stage medium consistency pulp pumping A centrifugal pump for pumping suspensions having a consistency of about 6-20% (for example, for pumping paper pulp) has a second stage for increasing head. An auxiliary impeller is connected to the drive shaft in front of the main impeller, and upon rota... | 01/20/1987 |
| 4458493 | Closed Rankine-cycle power plant utilizing organic working fluid A closed Rankine-cycle power plant (10) has a boiler (24) for vaporizing an organic working fluid and a first nozzle box (58) for receiving vaporized working fluid from the boiler (24) and for furnishing the fluid to a set of axial flow turbine blades (30... | 07/10/1984 |
| 4428715 | Multi-stage centrifugal compressor A centrifugal air compressor (11) has an annular air flow path (14) of progressively increasing diameter and progressively diminishing cross-sectional area in which a plurality of internal compression-diffusion stages (30) are provided. The stages of ... | 01/31/1984 |
| 4421454 | Turbines A full admission radial impulse turbine and turbines with full admission radial impulse stages. The last-mentioned turbines are of the single shaft, dual pressure type. Provision is made for utilizing working fluid exhausted from the high pressure section... | 12/20/1983 |
| 4406121 | Rotary fluid device A multiple stage energized fluiel flywheel is contained within a housing. An axially extending shaft is rotatably mounted within the housing. Fluid is introduced into the unit through an initial axial flow section and further pressure increases are experi... | 09/27/1983 |
| 4344723 | Vacuum grain moving apparatus A vacuum grain moving apparatus connected to a three-point hitch of a tractor and operated with the power take-off drive of the tractor. The apparatus has a grain holding tank connected to a grain collection hose used to carry grain and air to the tank. A... | 08/17/1982 |
| 4299536 | Multi-stage pumps A multi-stage pump embodying an inner housing of modular construction and embodying a plurality of axially aligned casing rings having impellers rotatably mounted therein, the casing rings being removably mounted relative to each other and, together with ... | 11/10/1981 |
| 4150916 | Axial flow inducers for hydraulic devices An axial flow inducer for hydraulic devices is disclosed. The inducer is coaxially arranged in front of a fluid suction inlet side of a main impeller of an hydraulic device, for example, a pump and constituted by at least two axial flow blade parts which ... | 04/24/1979 |
