Patents Examined by Eugene L. Szczecina, Jr.
  • Patent number: 4948348
    Abstract: An immersion pump, especially for low-boiling fluids, having a support for a shaft and a ferromagnetic impeller wheel mounted to the shaft. The support includes at least one controllable electromagnet that operates to axially support and position the impeller wheel. An outlet path is also provided to enable vapor bubbles within the moving fluid to escape from the pump and be returned to the liquid supply.
    Type: Grant
    Filed: May 4, 1988
    Date of Patent: August 14, 1990
    Inventors: Robert Doll, Werner Wiedemann, Hartmut Berndt
  • Patent number: 4946351
    Abstract: The present invention is a vertically upright hermetic compressor for mounting to a horizontal support surface in an appliance. It comprises a housing with a bottom end, a motor compressor unit operably disposed within the housing, and a resilient boot attached to the housing bottom end to suppress noise and vibration emitted from the compressor. A mounting plate supports the boot for mounting the compressor to the horizontal support surface. The plate receives the boot in a central aperture and has grommets for spacing the boot above the surface and attaching it to the horizontal support surface.
    Type: Grant
    Filed: June 14, 1989
    Date of Patent: August 7, 1990
    Assignee: Tecumseh Products Company
    Inventor: Hubert Richardson, Jr.
  • Patent number: 4943213
    Abstract: An internal axis rotary piston machine containing in a housing (2), an outer rotor (26), with which an inner rotor (8) having n engagement parts (9) is in meshing engagement, there being n+1 recesses between engagement parts (34) of the outer rotor (26). The inner rotor (8) and outer rotor (26) rotate uniformly at a speed ratio of (n+1):n. There is contact of the tooth-flank type between inside faces of the outer rotor (26) and outside faces of the inner rotor (8) such that working spaces (66) are formed and move past inlet and outlet orifices (63, 64) of the housing (2). The rotary piston machine is designed in such a way that cost-effective production can be achieved while assuring a simple construction. To achieve this, it is proposed that the housing (2) should have, on the drive side, a bottom (4) formed in one piece and should be made pot-shaped. The bottom (4) has an outer face for a bearing (30) of the outer rotor (26), especially on a ring (28) extending axially into the end of the outer rotor (6).
    Type: Grant
    Filed: May 16, 1988
    Date of Patent: July 24, 1990
    Assignee: Aktiengesellschaft Kuehnle, Kopp & Kausch
    Inventors: Arno Forster, Gerhard Oberholz, Christiane Romuss
  • Patent number: 4941808
    Abstract: A multi-mode, differential fluid displacement pump provides for at least two different measured doses. The pump has a chamber in which are mounted a first diameter piston and a second diameter piston defining first and second volumes for reciprocation in the chamber. Means are provided for reciprocating the pistons as desired to obtain predetermined volume changes corresponding to movement of either or both of the first and second pistons. A system of operation and a mixing chamber useful in connection with dosages from the pump are interconnected with the pump.
    Type: Grant
    Filed: June 29, 1988
    Date of Patent: July 17, 1990
    Inventors: Humayun Qureshi, Stanley M. Liffmann, John D. Czaban
  • Patent number: 4936824
    Abstract: An infant incubator is disclosed having a hood that encloses the infant compartment. In the base of the incubator is the heating air and ducting means and which provides heated through an ever open outlet in the base and which heated air passes from the base through a flow path formed by the hood that circulates around the infant and re-enters the base through an inlet. That heated air is thus introduced into or along the access door in the front of the hood from the outlet and travels through or along the access door and through or along the hood around the infant and is returned to the base for recirculation. The hood itself is pivotally attached to the base at the rear of the incubator so that it can be opened from the front for complete access to the infant. The access door in the front of the hood is pivotally attached to the incubator base and can also be opened for access to the infant. When the access door is in its closed position, it forms part of the air path for the heated air.
    Type: Grant
    Filed: May 15, 1987
    Date of Patent: June 26, 1990
    Assignee: The BOC Group, Inc.
    Inventors: Robert J. Koch, Anthony D. Buttitta
  • Patent number: 4936753
    Abstract: A double diaphragm pump is disclosed. The pump utilizes duckbill and ball-type check valves interchangeably. The check valves are held in place by intake and exhaust manifolds that are convertable to single or dual inlet or outlet manifolds.
    Type: Grant
    Filed: June 3, 1988
    Date of Patent: June 26, 1990
    Assignee: The Aro Corporation
    Inventors: Nicholas Kozumplik, Jr., Richard K. Gardner
  • Patent number: 4936758
    Abstract: A fluid pump is disclosed herein having a frame defining an internal pumping chamber in combination with a flexible diaphragm. A top ring retains the diaphragm in position on the frame and includes a central area carrying an actuation mechanism for cyclically maintaining the fluid pumping operation in the pumping chamber. Inlet and outlet valves are disposed in the frame and interconnected with the pumping chamber to complete the pump. The actuation mechanism includes a motor-driven eccentric cam coupled to the central diaphragm area with top surface attachment only.
    Type: Grant
    Filed: August 15, 1988
    Date of Patent: June 26, 1990
    Assignee: ACI Medical, Inc.
    Inventor: Stephen J. Coble
  • Patent number: 4934902
    Abstract: In accordance with the present invention, a diaphragm pump having a housing, a first chamber within said housing, a second chamber within said housing and a pair of diaphragm elements mounted in said housing between said first chamber and said second chamber, is provided with a failure sensing system for the diaphragm. The failure sensing system including a failure sensing device which is between the two parts of the diaphragm and an indicator circuit which includes the conductive liquid which is being pumped and an alarm. The two parts of the diaphragm element are clamped together proximate their peripheral edge such that a circumferentila fluid tight compression seal region is provided. The sensing device includes an electrically conductive lead which extends from the exterior of the housing, through the circumferential fluid tight seal region into the region peripherally inward of the seal region.
    Type: Grant
    Filed: November 9, 1988
    Date of Patent: June 19, 1990
    Inventor: Myron Mantell
  • Patent number: 4934907
    Abstract: A device for transporting and preheating fuel which is susceptible to cold temperatures comprises a pump which has an electromagnetic coil which is supplied with current to move a plunger for pumping the fuel so as to transport it. The plunger is returned for example, by a return spring and the electromagnetic coil is set out so that a maximum portion of the coil heats a fuel as it is passed through a pumping space. In accordance with the method of the invention, the coil has its own current supply control which advantageously may be set to supply a heating current which is in excess of that required for moving the plunger. A return spring set for returning the plunger may also be made stronger than necessary to effect return and the timing of the operation of the coil for moving the plunger may be set to be longer than necessary in order to keep the coil at a higher operating temperature and thus transform more heat to the fuel.
    Type: Grant
    Filed: September 7, 1988
    Date of Patent: June 19, 1990
    Assignee: J. Eberspacher
    Inventor: Martin Kroner
  • Patent number: 4934914
    Abstract: A portable motor pump of the type in which a pump section driven by a motor is installed inside a liquid chamber, with a discharge port of the pump section being opened into the liquid chamber, and in which water which is to be pumped is led from the outside of the liquid chamber to a suction port of the pump section and the pumped water is discharged from the liquid chamber to the outside is disclosed. The liquid chamber is defined by a motor pump body, a pump outer casing outwardly spaced from and surrounding the motor pump body, a motor head cover covering an upper opening of the pump outer casing and a bottom plate covering a lower opening of the pump outer casing. A circulating water suction port for self-priming of the motor pump is opened into the liquid chamber. A suction port which communicates with the suction port of the pump section and a discharge port for discharging the pumped water to the outside are provided in the motor head cover.
    Type: Grant
    Filed: July 29, 1988
    Date of Patent: June 19, 1990
    Assignee: Ebara Corporation
    Inventors: Makoto Kobayashi, Kiyoshi Ouchi, Shinji Nishimori, Tsuyoshi Maeda, Yoshio Miyake
  • Patent number: 4927338
    Abstract: A radial piston pump for the automotive brake system has a rotor, a couple of pistons reciprocated within a respective cylinder formed within the rotor and a bearing. The top end of the piston abuts directly to the inner surface so that no show is existed therebetween. The relationship within a starting point and a finishing point of a suction groove, a starting point and a finishing point of a disharge groove and an opening port the cylinder is designed in such a manner that at least one of a couple of cylinders connects to the suction groove during a whole rotation of the rotor.
    Type: Grant
    Filed: February 29, 1988
    Date of Patent: May 22, 1990
    Assignee: Nippondenso Co., Ltd.
    Inventors: Yoshiaki Ito, Kougi Nagai, Akihiko Sawada, Hideyuki Koike
  • Patent number: 4925376
    Abstract: A peristaltic pump for pumping fluids through a flexible tube is described which has a quick release and engagement mechanism that permits easy and rapid removal or insertion of the flexible tube into the device. The quick release and engagement mechanism of the invention consists of a shoe mounted for vertical displacement on the body of the pump. Upward movement of the shoe engages the flexible tube holding the fluid to be pumped and locks the tube against the roller assembly containing an eccentrically mounted roller which intermittently engages the tube and forces fluid out of it. To disengage the flexible tube from the pump, the shoe is moved downward out of contact with the flexible tube.
    Type: Grant
    Filed: July 11, 1988
    Date of Patent: May 15, 1990
    Assignee: Tek-Aids, Inc.
    Inventor: William F. Kahler
  • Patent number: 4925377
    Abstract: A blood pump, particularly intended as an extracorporeal blood pump, comprises a pump cylinder and two discs spaced apart in the longitudinal direction of the cylinder and substantially filling the cross-sectional area of the cylinder. The discs are reciprocatingly movable in accordance with a preferably variable movement pattern. Each of the discs is provided with a non-return valve means permitting fluid flow through the disc substantially solely in the desired direction of fluid transportation. The discs may be movable relative to the stationary pump cylinder surrounding the discs, or they may be firmly connected with the surrounding cylinder wall, which therewith accompanies the discs in their movements, the cylinder section between the discs having in this case a length which varies in response to the variation of the distance between the discs, and a correspondingly variable volume.
    Type: Grant
    Filed: May 27, 1988
    Date of Patent: May 15, 1990
    Assignee: Data Promeditech I.N.C. AB
    Inventors: Jorge Inacio, Erling Nilsson
  • Patent number: 4923375
    Abstract: A hose pump (1) consisting of a hose (2), at least one, preferably two pressure rollers (3,4), a support plate (9) and a drive source (26). The hose (2) is paced in a hose receiving track (6) in the support plate (9). The rollers (3,4) are rotatably journalled on a common rotary shaft (10), whose center (11) is firmly connected with a drive shaft (12), which is perpendicular to the support face (5) of the support plate (9) engaging the rollers (3,4). The rollers (3,4) act on the hose (2) in the flow direction of the pump (1) and alternately determine, in specific angle ranges, the liquid volume flow discharged. The succeeding roller (4) cooperates with the hose (2) in such a manner that the hose is completely closed when the forwardly disposed roller (3), as seen in the flow direction, initiates its disengaging movement away from the hose (2).
    Type: Grant
    Filed: March 1, 1989
    Date of Patent: May 8, 1990
    Inventor: Henning M. Ejlersen
  • Patent number: 4923464
    Abstract: An intravascular prosthesis comprises a lining rolled upon itself around an axis so that it is introducible into a vascular lumen. An inflatable channel is included for unrolling the lining when the prosthesis is positioned within the lumen so that the lining may engage the vascular wall to provide support therefor.
    Type: Grant
    Filed: September 3, 1985
    Date of Patent: May 8, 1990
    Assignee: Becton, Dickinson and Company
    Inventor: Joseph A. DiPisa, Jr.
  • Patent number: 4923372
    Abstract: A gas operated, plunger lift type pump for use in a subterranean well conduit which extends from a pool of well liquids to the surface comprises a tubular plunger slidably and sealingly mounted in the well conduit and defining a fluid flow passage through the tubular body. An annular valve seat is fixedly mounted within the tubular body and an axially shiftable valve head is engagable with the valve seat to prevent fluid flow through the fluid passage. The valve head is biased to an open position by a surface applied trapped fluid pressure which approximates the hydrostatic pressure existing in the well at the liquid level to which the plunger is permitted to descend, and is further retained in the open position by a latching collet. As the plunger rises in the well due to the gas pressure existing below the plunger, it will raise the fluids trapped above the plunger to discharge through vertically spaced discharge ports.
    Type: Grant
    Filed: January 13, 1989
    Date of Patent: May 8, 1990
    Assignee: Ferguson Beauregard Inc.
    Inventors: Paul L. Ferguson, Robert W. Dinning
  • Patent number: 4917581
    Abstract: A mounting boot for mounting a vertical hermetic compressor to a horizontal base, includes a resilient cup-shaped member to receive the bottom end of the compressor housing. A cylindrical inner wall surface of the cup-shaped member frictionally engages the sidewall of the compressor. The bottom end of the compressor housing comprises a plate member having a radially extending flange portion resiliently enveloped by the inner wall surface of the cup-shaped member. The bottom end of the compressor housing is spaced from the bottom wall of the mounting boot, thereby defining an enclosed muffling chamber to suppress noises radiated from the compressor bottom end. The mounting boot is formed with radially extending mounting feet, and passages through which compressor inlet and outlet tubes may extend.
    Type: Grant
    Filed: September 12, 1988
    Date of Patent: April 17, 1990
    Assignee: Tecumseh Products Company
    Inventors: Hubert Richardson, Jr., Phillip A. Tomell, Michael J. Maertens
  • Patent number: 4913629
    Abstract: A wellpoint pumping system having a frame and a positive displacement rotary pump for pumping air, water or a mixture thereof mounted on the frame. The pump has two rotors with intermeshing lobes mounted on horizontal and parallel shafts, an inlet port below the rotors and an outlet port above the rotors. A motor for driving the rotors is mounted on the frame and a coupler connects the motor to the rotors. A closed inlet reservoir is formed in the frame below the pump, and an outlet reservoir is mounted on the frame at a level above the inlet reservoir. A conduit depends from the pump inlet port into the inlet reservoir and terminates close to the bottom of the inlet reservoir and a conduit connects the outlet port of the pump with the outlet reservoir.
    Type: Grant
    Filed: August 26, 1988
    Date of Patent: April 3, 1990
    Inventor: William C. Gilfillan
  • Patent number: 4911613
    Abstract: A motorless water pump for utilizing the rate of flow of falling water to pump the same to a higher location. The pump utilizes a phenomenon known as "water hammer" to use the force of the running water to close a valve and pump the water to a higher location. The pump is economical, portable and contains relatively few moving internal parts.
    Type: Grant
    Filed: October 24, 1988
    Date of Patent: March 27, 1990
    Assignees: Larry A. Cox, Louis B. Garcia
    Inventor: Larry A. Cox
  • Patent number: 4909713
    Abstract: A peristaltic pump comprising a race having an internal surface for supporting a flexible tube in a tube pumping region, and a rotor rotatably mounted about a rotor axis and carrying rollers that travel in a circular path adjacent to the tube pumping region, the rollers having a large diameter central portion between smaller diameter portions to cause the tube to be self-aligning at the central portion. Also disclosed are a cover mounted on the race for movement in a direction parallel to the rotation axis between a loading position spaced from the race sufficiently to permit insertion of the tube through a tube insertion opening into a tube mounting region and an operational position in which the tube insertion opening is closed; and self-loading a tube into a peristaltic pump via rollers having a small diameter end portion and an adjacent larger diameter portion.
    Type: Grant
    Filed: May 7, 1986
    Date of Patent: March 20, 1990
    Assignee: Cobe Laboratories, Inc.
    Inventors: P. Michael Finsterwald, George J. Eilers