Patents Examined by David L. Cavanaugh
  • Patent number: 5199864
    Abstract: A fluidic machine operable primarily as a pump or a fluid motor having primary and secondary vaned members hinged together within a spherical pump chamber to define four intake and exhaust spaces of varying volumes. A tracking mechanism which includes an annular raceway forces the secondary member to rotate about an oblique axis as the primary member rotates about a primary axis. Consequently, rotation of an input/output shaft extending from the primary member along the primary axis forces the secondary member to pivotally reciprocate between opposite extremes relative to the primary member, thereby increasing and decreasing the volumes of the spaces to produce a pumping action. The pump chamber is provided with four ports in positions which are coordinated with the tracking mechanism to ensure one port is in fluid communication with each space throughout each pivotal stroke of the secondary member.
    Type: Grant
    Filed: September 28, 1990
    Date of Patent: April 6, 1993
    Assignee: Southwest Research Institute
    Inventor: Gary L. Stecklein
  • Patent number: 5192201
    Abstract: A rotary engine includes a pair of rotors each supporting opposed toroidal section pistons rotatably disposed within a crank case defining a toroidal combustion chamber. The piston rotors define pluralities of curved slots which receive interconnecting coupling pins. A drive cam cooperates with the drive pins and a slotted pin guide is captivated between the drive cam and one of the slotted piston rotors. The cooperation of the pin guide, cam and slotted rotors provides the required piston motion and power coupling for use as a rotary engine for rotary pump or compressor.
    Type: Grant
    Filed: October 15, 1990
    Date of Patent: March 9, 1993
    Inventor: Jacek Beben
  • Patent number: 5180296
    Abstract: A circular piston engine or machine is provided having a rotor with outer teeth and fixedly connected for rotation with the shaft. The rotor cooperates with an outer gear having inner teeth. The outer gear is supported by the housing at its outside and the user ports extend axially in the control housing.
    Type: Grant
    Filed: December 2, 1991
    Date of Patent: January 19, 1993
    Assignee: Mannesmann Rexroth GmbH
    Inventor: Horst Mehling
  • Patent number: 5180297
    Abstract: An improved sealing apparatus for gear transfer pump of the type that includes a gear driven by a drive shaft connected to a drive source. The drive shaft extends through a backhead which includes a seal system for inhibiting fluid leakage between the drive shaft and the backhead. The seal system includes a tubular insert held at one end by a support element threadedly received in an end bore of the backhead and structure defined by the backhead which engages another portion of the insert and includes a secondary seal for inhibiting fluid leakage between the insert and the backhead. The insert includes structure for mounting at least a portion of the seal in predetermined alignment with the drive shaft. The drive shaft includes an abutment for locating a rotating portion of the seal for applications that include two-part seals. A seal cartridge is disclosed in which non-rotating and rotating portions of the seal form a single assembly that is installed as a unit into the backhead.
    Type: Grant
    Filed: March 22, 1991
    Date of Patent: January 19, 1993
    Assignee: The Gorman-Rupp Company
    Inventors: Milton N. Hansen, Steven D. McMahon
  • Patent number: 5180298
    Abstract: A noise-absorbing medium is provided as an insert within the inner volume of the outlet chamber of a displacement-type pump. In an axial-flow displacement pump, this is the chamber into which pumped hydraulic fluid is discharged, for side-ported delivery to piping which serves the end-use actuator or other use component of the involved hydraulic system. The noise-absorbing medium is a preformed body (or bodies) of foamed elastomeric material having a sealed external skin and containing tiny closed cells of entrapped gas at low pressure; the encapsulated gas within the body bears a predetermined fractional volumetric proportion to the overall volume of the body, and the overall volume of the body also bears a predetermined relation to the overall volume of the outlet chamber.
    Type: Grant
    Filed: January 23, 1991
    Date of Patent: January 19, 1993
    Assignee: IMO Industries Inc.
    Inventor: John DiRe
  • Patent number: 5171142
    Abstract: A rotary displacement machine has a casing (1) having a spherical interior space accommodating a rotor. The rotor is spherical and is formed by a disc-shaped partition (2) having on either side thereof pivotally vanes (3, 4). The vanes (3, 4) are connected to the partition (2) along the diameter, extend in mutally perpendicular planes and are connected to power takeoff shafts (5, 5') extending at an angle with respect to each other. The pivotal connection of the partition (2) to each vane (3, 4) is in the form of mating cylindrical projections (9, 9' ) of the partition of the vanes (3, 4). Axes (a, b) of the projections (9, 9') of the partition (2) extend mutually perpendicularly and in one and the same plane.
    Type: Grant
    Filed: January 14, 1991
    Date of Patent: December 15, 1992
    Assignee: Tselevoi Nauchno-Tekhnichesky Kooperativ "Stimer"
    Inventor: Leonid P. Proglyada
  • Patent number: 5163826
    Abstract: A crescent pump gear including: a housing having a chamber communicating with an intake port and a discharge port; a shaft journaled for rotation within said chamber; an externally toothed inner gear mounted centrally on said shaft about a first axis; an internally toothed annular gear eccentrically mounted for rotational engagement with said inner gear about a second axis; a crescent contacting a portion of said inner gear has a dual cycloidal tooth profile generated about a first generating circle and said outer gear has a dual cycloidal tooth profile generated about a second generating circle.
    Type: Grant
    Filed: October 23, 1990
    Date of Patent: November 17, 1992
    Inventor: Eric E. Cozens
  • Patent number: 5163825
    Abstract: An articulated air vane air or hydraulic motor has a rotor core disposed coaxially in a cylindrical housing, with a plurality of articulating vanes that seat in axial sockets or slots in the rotor core. A crescent shaped insert defines a cam surface in the chamber between the housing and the core. Inlet and exhaust ports are formed either in the housing cylinder or in the end plates. Vane wear is significantly reduced and injected lubricant is not required. The vanes can be generally P-shaped in cross section, with stop structure to limit the articulating motion.
    Type: Grant
    Filed: April 3, 1991
    Date of Patent: November 17, 1992
    Inventor: Roy E. Oetting
  • Patent number: 5163824
    Abstract: A gear pump is described for pumping extremely low volumes of fluid at extremely low rates of flow. The pump includes a housing with a cavity therein and a pair of gears rotatable within said cavity. One of the gears is shafted and the other is shaftless, and the gears are made of resilient material with the diameter of the periphery of the tips of the gear teeth exceeding the diameter of the cavity in which they rotate. The face width of the gears also exceeds the depth of the cavity in which they rotate.
    Type: Grant
    Filed: February 6, 1992
    Date of Patent: November 17, 1992
    Assignee: Transcience Associates Inc.
    Inventor: Harold H. Kantner
  • Patent number: 5161961
    Abstract: By using multiple external gears and internal gears, which are engaged with each other, and multiple radial sealing elements and axial sealing elements, a pump or motor, which includes multiple equivalent pumps or motors, is made. Each gear included in thus made gear pump or motor is radially hydraulically counterbalanced, even completely hydro-mechanically counterbalanced, loads on bearings being able to become zero. Axial gaps and radial gaps both have been compensated. The pump or motor can stagelessly vary its output. Accordingly, a gear pump or motor with constant output or stagelessly variable output, as well as a relevant stageless hydraulic speed variator, can be made, which will have lower production cost, higher transmission efficiency and higher power density.
    Type: Grant
    Filed: February 20, 1991
    Date of Patent: November 10, 1992
    Inventor: Yue Zheng
  • Patent number: 5160252
    Abstract: A fluid displacement machine of the vane type which can be operated as a compressor or motor utilizes a cylindrical rotor equipped with one or more tethered sliding vanes wherein the rotor and vane set is rotatably located eccentrically inside an internal conforming casing profile between opposing endplates to define enclosed variable volume compartments. [Each vane is fitted on opposite sides eith tethers which are pivotally-mounted remotely from the vane tips. The tethers engage, through anti-friction means, circular annuli located within the endplates which are eccentric with the hollow casing profile.] Anti-friction tether-to-annuli means are used, one in the form of freely-rotating caged roller bearings interposed between the tethers and the respective internal annuli, and another in the form of tethers equipped with trunnioned bearings which directly engage these internal annular surfaces.
    Type: Grant
    Filed: June 20, 1991
    Date of Patent: November 3, 1992
    Inventor: Thomas C. Edwards
  • Patent number: 5160247
    Abstract: A hermetic compressor including a hardened cylindrical pin bearing disposed through the crankshaft permits a line contact between the crankshaft and bearing hub for a more efficient compressor. The pin bearing reduces friction while increasing compressor efficiency. In one embodiment, the hardened steel pin is constructed in two parts permitting rotation within the crankshaft. In another embodiment, hardened metal sleeves surround the cylindrical bearing pin allowing.
    Type: Grant
    Filed: September 24, 1991
    Date of Patent: November 3, 1992
    Assignee: Tecumseh Products Company
    Inventor: Tara C. Kandpal
  • Patent number: 5156540
    Abstract: Feed unit, in particular for the feeding of fuel, having an electric drive motor and a pump unit coupled to it, which comprises a base plate, an intermediate plate having a recess for rotating pump parts and a cover, at least the base plate and the cover consisting of a ceramic material and the end sides of the base plate and of the cover which face the intermediate plate having ground surfaces.
    Type: Grant
    Filed: May 10, 1991
    Date of Patent: October 20, 1992
    Assignee: VDO Adolf Schindling AG
    Inventors: Norbert Fernau, Helmut Kohlhaas
  • Patent number: 5156532
    Abstract: A rotary vane vacuum pump includes a pump housing; a bearing support having a bearing bore; a drive motor having an output shaft extending into the bearing bore; and a pump rotor accommodated in the pump housing and having a rotor shaft extending into the bearing bore. The rotor shaft and the output shaft have respective radial end faces oriented towards one another and the output shaft and the rotor shaft have identical diameters. There is further provided a torque-transmitting coupling connecting the output shaft with the rotor shaft at respective radial end faces thereof; a first sealing ring situated in the bore and sealingly surrounding the output shaft; a second sealing ring situated in the bore and sealingly surrounding the rotor shaft; and a lubricant chamber formed by a part of the bearing bore and being bounded and sealed by the first and second sealing rings.
    Type: Grant
    Filed: May 29, 1991
    Date of Patent: October 20, 1992
    Assignee: Leybold AG
    Inventors: Lutz Arndt, Peter Muller, Dieter Vorberg
  • Patent number: 5156541
    Abstract: A positive displacement pump-motor-meter has a housing structure and a rotor disposed within and supported by the housing structure in a rotatable arrangement about an axis of rotation, wherein the combination of the housing structure and the rotor provides a toroidal cavity encircling the axis of rotation and having cross sectional area varying from a maximum value at the 12 o'clock position to a minimum value at the 6 o'clock position, which toroidal cavity houses a plurality of planar vanes disposed therealong in an axisymmetric arrangement about the axis of rotation and supported by the rotor member in a revolvable arrangement about respective axes of revolution, of wherein the revolving motion of each of the plurality of vanes about its respective axis of revolution is coupled to the rotating motion of the rotor about the axis of rotation in such a way that the vane revolves at an angular speed equal to one half of the angular speed of the rotor, whereby each of the plurality of planar vanes substantiall
    Type: Grant
    Filed: May 7, 1991
    Date of Patent: October 20, 1992
    Inventor: Hyok S. Lew
  • Patent number: 5154587
    Abstract: A magnet pump is provided with a heat insulating member arranged between a shaft serving as the rotating axis and an impeller or a magnet can, heat conduction cut-off grooves on a heat conducting path, and a safety lock mechanism. These elements ensures to prevent frictional heat, even if generated due to abnormal operating conditions such as a non-load operation, from being conduted to parts with lower heat resistivity such as the impeller and the casing, deflection in rotation caused by looseness due to thermal expansion, and accordingly the magnet pump is protected from damages.
    Type: Grant
    Filed: September 12, 1990
    Date of Patent: October 13, 1992
    Assignee: World Chemical Co., Ltd.
    Inventors: Yozi Mori, Norishige Hirakawa
  • Patent number: 5152684
    Abstract: A dual rotor Roots type vacuum pump has an improved rotor profile contour resulting in high area efficiency, high volumetric efficiency, reduced backstreaming and simplified economical manufacturing which yields a compact, cost effective pump.
    Type: Grant
    Filed: August 27, 1991
    Date of Patent: October 6, 1992
    Assignee: Leybold Aktiengesellschaft
    Inventor: Ralf Steffens
  • Patent number: 5152683
    Abstract: A dual piston rotary pump (10) having a housing (12) equipped with two ports (13a, 13b) to accommodate fluid flow through the housing (12) and having two generally cylindrical chambers (14a, 14b) within which cylindrical pistons (16a, 16b) are disposed. The chambers (14a, 14b) intersect to form a passage (15) therebetween and to allow the pistons (16a, 16b) to engage in tangential contact. Each piston (16a, 16b) rotates within its chamber (14a, 14b) in a direction counter to the direction of the other piston while maintaining tangential contact with the other piston and at least one piston is in tangential contact with its chamber wall. The pump includes variable offset transmission means (52a, 50a, 48a, 54a) to change the offset of the center of the piston from the center of rotation of the piston during the course of each rotation to allow the pistons (16a, 16b) to remain in mutual tangential contact at all times.
    Type: Grant
    Filed: June 27, 1991
    Date of Patent: October 6, 1992
    Inventor: Richard L. Signorelli
  • Patent number: 5151021
    Abstract: In a fluid compressor, a cylinder is arranged within a sealed casing. A piston having a spiral groove is placed within the cylinder. The piston is made eccentric to the cylinder such that part of the piston is put in contact with the inner peripheral surface of the cylinder. The piston and the cylinder are rotated relative to each other. A spiral blade is fitted in the spiral groove. The blade is put in contact with the inner peripheral surface of the cylinder, and forming a plurality of working chambers. The blade freely projects from and retreats in the groove. A fluid to be compressed is sucked in the working chambers. The compressed fluid is discharged from a discharge hole portion into the sealed casing. A support mechanism supports the cylinder and one of bearing members for supporting shaft portions of the piston. The support mechanism receives the lubricating oil mixed in the high-pressure compressed fluid discharged from the discharge hole portion.
    Type: Grant
    Filed: January 30, 1992
    Date of Patent: September 29, 1992
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Takayoshi Fujiwara, Hisanori Honma
  • Patent number: 5149256
    Abstract: A rotary positive-displacement machine of the type having intermeshing lobed rotors, comprising first and second two-lobed rotors mounted respectively in the two housing bores for synchronous rotation. The first, valve rotor has a hub portion which periodically occludes an outlet port to control the generation and discharge of high pressure fluid from the housing. Each lobe of the valve rotor has a leading tip portion which is radiussed so that it does not define a sharp edge. Each lobe also has an outer flank, a major portion of which is a convex curve, which is generated to correspond to the form of the tip of the second, displacement rotor and which merges with a convex arcuate portion whose center is offset from the valve rotor axis.
    Type: Grant
    Filed: April 25, 1991
    Date of Patent: September 22, 1992
    Assignee: The Drum Engineering Company Limited
    Inventor: Lothar P. Schmitz