Distributor Adjustment Patents (Class 417/427)
  • Patent number: 11660485
    Abstract: Systems and methods for fire suppression systems are disclosed. In one embodiment, the fire suppression system comprises a water supply system, a foam concentrate supply system, and a foam concentrate recovery system. The water supply system includes a water pump and a water supply line. The foam concentrate supply system includes a foam pump and a foam concentrate supply line, the foam concentrate supply line fluidly connected with the water supply system to facilitate mixing foam concentrate provided by the foam concentrate supply system with water provided by the water supply system. The foam concentrate recovery system includes a recovery pump fluidly connectable with the foam concentrate supply system to facilitate the extraction of foam concentrate from at least a portion of the foam concentrate supply system. The system and method can also include circulating foam concentrate to promote mixing and hinder the congealment of foam concentrate.
    Type: Grant
    Filed: May 15, 2020
    Date of Patent: May 30, 2023
    Assignee: E-One, Inc.
    Inventors: Stephen B. Swayze, James Roger Lackore, Jr.
  • Patent number: 11428225
    Abstract: A multistage compression system uses refrigerant and oil. The multistage compression system includes a low-stage compressor that compresses the refrigerant, a high-stage compressor that further compresses the refrigerant compressed by the low-stage compressor, an oil return pipe that returns the oil discharged by the high-stage compressor to the low-stage compressor, and an oil discharge pipe that discharges the oil in the low-stage compressor. The low-stage compressor includes a compression part that compresses the refrigerant, a motor that drives the compression part, and a container that houses the compression part and the motor. The container forms a high-pressure space storing compressed refrigerant. Inside of the oil return pipe and inside of the oil discharge pipe are connected to the high-pressure space.
    Type: Grant
    Filed: September 25, 2019
    Date of Patent: August 30, 2022
    Assignee: Daikin Industries, Ltd.
    Inventors: Daisuke Okamoto, Mikio Kajiwara, Yohei Nishide, Naoto Tomioka, Masaaki Adachi, Yousuke Ohnishi, Akitoshi Ueno, Takuya Horita, Masaaki Takegami
  • Patent number: 11015726
    Abstract: A disclosure pertains to a reciprocating pump configured for pumping fillers or aggregates or cementitious material and the like.
    Type: Grant
    Filed: November 10, 2016
    Date of Patent: May 25, 2021
    Assignee: Graco Minnesota Inc.
    Inventors: John R Scopelite, Ralph C Angiuli, Charles J Wheeler
  • Patent number: 9389005
    Abstract: In a two-stage compression refrigeration cycle device, a low-pressure side compression mechanism and a high-pressure side compression mechanism are intermittently operated to control such that the temperature of air blown into a freezer approaches a target temperature. Under the control, the high-pressure side compression mechanism is first stopped, and then the low-pressure side compression mechanism is stopped. Further, when a reference time has elapsed after driving the high-pressure side compression mechanism, then the low-pressure side compression mechanism is driven. The refrigeration cycle device can reduce a high-pressure side pressure difference upon driving the high-pressure side compression mechanism, and can also reduce a low-pressure side pressure difference upon driving the low-pressure side compression mechanism.
    Type: Grant
    Filed: September 6, 2011
    Date of Patent: July 12, 2016
    Assignee: DENSO CORPORATION
    Inventors: Ryo Takizawa, Masami Taniguchi, Jun Yamazaki
  • Patent number: 9334860
    Abstract: A bi-directional pump system that can be configured for a plurality of operating modes. The bi-directional pump system includes a plurality of bi-directional pumps each having their own valving system that are connected to a common high pressure manifold, a low pressure manifold and a suction manifold. Via the respective valve systems, each pump can be configured into: (1) a single-acting pumping mode; (2) a double-acting pumping mode; (3) an inactive free motion mode; and (4) an inactive rigid mode. One exemplary application of the bi-directional pump system is on an articulated wave energy conversion system that consists of three floating barges: a front barge, a center barge and a rear barge where the front barge and center barge are hingedly connected as are the center barge and the rear barge. A first set of the bi-directional pumps span the first hinge connection and the second set of bi-directional pumps span the second hinge connection.
    Type: Grant
    Filed: July 11, 2014
    Date of Patent: May 10, 2016
    Assignee: Murtech, Inc.
    Inventors: Kenneth A. Knowles, Jr., Robert C. Murtha, Jr., Christina Speight
  • Patent number: 9004881
    Abstract: A fluid pump includes a pump body enclosing a first cavity and a second cavity, a first flexible member disposed within the first cavity, a second flexible member disposed within the second cavity, and a drive shaft extending between and attached to each of the first flexible member and the second flexible member. The drive shaft is configured to slide back and forth within the pump body. The pump also includes a first shift valve and a second shift valve disposed between the first flexible member and the second flexible member, operatively coupled to deliver a drive fluid to drive fluid chambers in alternating sequence. Some fluid pumps disclosed herein include a housing defining a modular-receiving cavity and a modular insert secured within the modular-receiving cavity by an interference fit. Methods of manufacturing and using fluid pumps are also disclosed.
    Type: Grant
    Filed: April 20, 2012
    Date of Patent: April 14, 2015
    Assignee: Simmons Development, LLC
    Inventors: Tom M. Simmons, John M. Simmons, David M. Simmons, Bruce Johnson
  • Patent number: 8936443
    Abstract: An approach is provided in which a cooling manager detects a failed fan included in an electronic enclosure. The electronic enclosure includes multiple fans that each cool different component areas in the electronic enclosure. The cooling manager selects an airflow compensator that corresponds to a functioning fan included in the electronic enclosure, which includes a fixed perforated member and a movable perforated member. In turn, the cooling manager adjusts the selected airflow compensator to redirect a portion of airflow generated by the functioning fan to the component area corresponding to the failed fan.
    Type: Grant
    Filed: July 31, 2012
    Date of Patent: January 20, 2015
    Assignee: International Business Machines Corporation
    Inventors: Benjamin William Mashak, Arden Lot Moore, Katie L. Pizzolato
  • Patent number: 8764405
    Abstract: An approach is provided in which a cooling manager detects a failed fan included in an electronic enclosure. The electronic enclosure includes multiple fans that each cool different component areas in the electronic enclosure. The cooling manager selects an airflow compensator that corresponds to a functioning fan included in the electronic enclosure, which includes a fixed perforated member and a movable perforated member. In turn, the cooling manager adjusts the selected airflow compensator to redirect a portion of airflow generated by the functioning fan to the component area corresponding to the failed fan.
    Type: Grant
    Filed: January 14, 2013
    Date of Patent: July 1, 2014
    Assignee: International Business Machines Corporation
    Inventors: Benjamin William Mashak, Arden Lot Moore, Katie L. Pizzolato
  • Patent number: 8616857
    Abstract: An oil pump unit with a variable flow rate includes lubrication pumps and a control pump that are driven by rotation of a crankshaft of an engine, and changes an oil supply amount from the control pump to each part of the engine, in which the control pump includes a plurality of oil pumps that have different discharge rates.
    Type: Grant
    Filed: September 9, 2011
    Date of Patent: December 31, 2013
    Assignees: Yamada Manufacturing Co., Ltd., Honda Motor Co., Ltd.
    Inventors: Keiichi Kai, Junichi Miyajima, Noriyuki Kawamata, Toshimasa Mitsubori, Satoshi Ino
  • Patent number: 8287255
    Abstract: A variable displacement rotary pump includes a main pump unit, an auxiliary pump unit, a discharge passage, a bypass passage, a suction passage, a check valve and a control valve. The suction passage is in communication with the discharge passage through the bypass passage and a second discharge port. The check valve is disposed in the discharge passage for preventing fluid in a first discharge port of the main pump unit from flowing into the bypass passage. The control valve is operable for opening and closing the bypass passage. When the control valve opens the bypass passage and the check valve closes the discharge passage, flow rate of the fluid discharged from the discharge passage is reduced. A throttle passage is provided in the bypass passage or the control valve for regulating flow of the fluid in early phase of operation of the control valve to open the bypass passage.
    Type: Grant
    Filed: August 24, 2009
    Date of Patent: October 16, 2012
    Assignee: Kabushiki Kaisha Toyota Jidoshokki
    Inventors: Hironao Yokoi, Shigeru Suzuki, Katsumi Yamashita, Toshiro Fujii
  • Patent number: 8206134
    Abstract: A power pack unit includes a first hydraulic pump including a first pump enclosure accommodating a first pump cartridge. A second hydraulic pump includes a second pump enclosure accommodating a second pump cartridge. A hydraulic fluid reservoir is positioned between the first and second hydraulic pumps. A first end of the reservoir is secured to the first pump enclosure and a second end of the reservoir is secured to the second pump enclosure. The first and second hydraulic pumps and the reservoir can extend along a common axis. First and second motors can be connected to the first and second pumps. The entire structure can extend along a common axis.
    Type: Grant
    Filed: June 2, 2008
    Date of Patent: June 26, 2012
    Assignee: Maradyne Corporation
    Inventors: Ion Moldovan, Paul Ellsworth
  • Publication number: 20110311374
    Abstract: A technique is provided for pumping fluids in a subterranean wellbore. A submersible pumping system can be deployed in a wellbore for moving desired fluids within the wellbore. The pumping system energizes the desired fluid movement by reciprocating a working fluid between expandable members.
    Type: Application
    Filed: August 18, 2011
    Publication date: December 22, 2011
    Applicant: Schlumberger Technology Corporation
    Inventors: Murat Ocalan, Steven Dornak
  • Patent number: 8011904
    Abstract: A gas feed assembly (30) comprises a compressor arrangement (32) comprising first and second compressor (34, 36). The gas feed assembly includes an outlet (42) for gas for the first and second compressors (34, 36). The gas feed assembly includes a first inlet (38) for the first compressor (34) and a second inlet (40) for the second compressor (36). The gas feed assembly further includes a valve assembly (52, 64) for allowing gas to enter either, or both, of the first and second compressors from at least one gas source.
    Type: Grant
    Filed: October 10, 2006
    Date of Patent: September 6, 2011
    Assignee: Rolls-Royce plc
    Inventors: Alan R Maguire, Matthew W Whellens, Glenn A Knight
  • Patent number: 7945989
    Abstract: A wet extraction floor cleaning device having a base assembly adapted for movement on a surface being cleaned, an operating handle pivotally attached to the base assembly, a supply tank having a supply tank outlet, and a recovery tank having a recovery tank inlet and a recovery tank outlet. The base assembly has an inlet nozzle that extends from an inlet slit proximal the surface being cleaned to a nozzle outlet. The device further includes a fluid deposition assembly that can be selectively placed in fluid communication with the supply tank outlet, a vacuum source, and first and second external pockets. The supply and recovery tanks are adapted to be selectively placed in the first and second external pockets, thereby placing the supply tank outlet in fluid communication with the fluid deposition system, the recovery tank inlet in fluid communication with the nozzle outlet, and the recovery tank outlet in fluid communication with the vacuum source inlet.
    Type: Grant
    Filed: May 19, 2008
    Date of Patent: May 24, 2011
    Assignee: Electrolux Home Care Products, Inc.
    Inventors: Arnie Sepke, Randall Sandlin, Vince Bobrosky, Bill Reimer
  • Patent number: 7785083
    Abstract: The dynamic fluid device has a first pumping arrangement and second pumping arrangement arranged in parallel with each other to pump a pressurized fluid to user devices; at least a distributor member interposed amongst the first pumping arrangement, second pumping arrangement and the user devices and connected to them with connection arrangements, the at least a distributor member being arranged to connect singly and/or jointly and/or according to predetermined sequences, the first pumping arrangement and/or the second pumping arrangement to the user devices.
    Type: Grant
    Filed: October 24, 2006
    Date of Patent: August 31, 2010
    Assignee: Studio Tecnico 6M S.R.L.
    Inventors: Eronne Mamei, Omer Mamei, Enrico Mamei
  • Patent number: 7090475
    Abstract: A hydraulic control circuit for a radial piston engine with two speeds. The changeover between the speeds takes place through the alteration of the absorption volume, the delivery side being connected to the discharge side with a bypass connection by a valve arrangement for a selected number of engine pistons. The control circuit provides a space-saving way of ensuring that the changeover between speeds occurs smoothly and in such a manner to preserve the individual components as far as possible. To this end, at least one intermediate switching position, in which the delivery side is throttled to the discharge side, i.e. connected by a diaphragm-type arrangement, is provided in front of valve arrangement between the two end switching positions. The valve arrangement is preferably driven such that a valve body can be moved through the intermediate switching position at a controlled speed.
    Type: Grant
    Filed: February 15, 2001
    Date of Patent: August 15, 2006
    Assignee: Mannesmann Rexroth AG
    Inventor: Chris Shrive
  • Patent number: 6712591
    Abstract: A discharge valve of a hermetic compressor includes a valve plate disposed on a cylinder head that draws in and discharges refrigerant according to reciprocal movement of a piston, and the discharge valve having a discharge hole formed therein through which refrigerant is discharged, a disc valve disposed adjacent the discharge hole of the valve plate, the disc valve being raised or lowered by the reciprocal movement of the piston and disc valve weight, and a stopper disposed above the disc valve, for guiding the raising and lowering of the disc valve and also for limiting the height to which the disc valve may be raised. The compressor is not subject to overload or over pressurization that may otherwise result from an elastic closing force operating in the valve, and as a result, compression efficiency is increased, while noise is decreased.
    Type: Grant
    Filed: May 8, 2002
    Date of Patent: March 30, 2004
    Assignee: Samsung Gwangju Electronics Co., Ltd.
    Inventor: Sung-tae Lee
  • Publication number: 20030086789
    Abstract: A multi-compressor system is described, which includes a fluid distribution system, a base compressor set, a flow controller, a trim compressor set, and a trim volume. The multi-compressor system provides compressed fluid to a load device set. The fluid distribution system is coupled to the load device set. The base compressor set is coupled to the fluid distribution system. The flow controller has a downstream side coupled to the fluid distribution system, and an upstream side coupled to a trim compressor set. The trim volume is coupled between the outlet of the trim compressor set and the upstream side of the flow controller.
    Type: Application
    Filed: July 23, 2002
    Publication date: May 8, 2003
    Inventor: Sridharan Raghavachari
  • Patent number: 6483216
    Abstract: In a vacuum pump according to the invention, the rotor is held inside the stator by radial magnetic bearings, and its radial movements are limited by one or more landing mechanical bearings each made up of a rotor rolling bearing race and a stator rolling bearing race. At least one coaxial ring of elastomer in the shape of a torus is inserted between the outside peripheral surface of the stator rolling bearing race and the stator itself to constitute a damped elastic connection which significantly increases the reliability and the service life of the landing mechanical bearing.
    Type: Grant
    Filed: January 29, 2001
    Date of Patent: November 19, 2002
    Assignee: Alcatel
    Inventors: André Bouille, Jean-Emile Chollet
  • Patent number: 6471477
    Abstract: A jet actuator positioned within a hollow space in an aerodynamic structure for controlling the flow over an aerodynamic surface thereof includes a movable member linearly displaced by a voice coil mechanism and a flexible diaphragm defining a compression chamber open to the exterior of the aerodynamic surface through an orifice. Reciprocal displacement of the movable member changes the shape of the flexible diaphragm to alternately expel fluid (e.g., air) from and pull fluid into the compression chamber through the orifice. The movable member includes a pair of pistons joined by a cross element, one of the pistons being attached to the flexible diaphragm. In one embodiment, the flexible diaphragm comprises a bladder sealed around the orifice. The movable member is desirably made of composite material to reduce its inertia, and at least the piston attached to the flexible diaphragm may be stiffened with a composite laminate structure.
    Type: Grant
    Filed: December 22, 2000
    Date of Patent: October 29, 2002
    Assignee: The Boeing Company
    Inventors: Ahmed A. Hassan, David B. Domzalski
  • Patent number: 6206651
    Abstract: The invention relates to an oil pump for an internal combustion engine with at least one pair of toothed wheels which are in mutual engagement, at least one intake port and at least one outlet port. An improved supply of oil at reduced driving power can be achieved with at least two pairs of toothed wheels; a first common shaft, which a first toothed wheel of each pair of toothed wheels is arranged, and means are provided to charge the individual pairs of toothed wheels with oil depending on the required quantity of conveyed oil.
    Type: Grant
    Filed: February 25, 1999
    Date of Patent: March 27, 2001
    Assignee: TCG Unitech Aktiengesellschaft
    Inventors: Heinz Klaus, Gerald Buha
  • Patent number: 6183207
    Abstract: A pump which can operate in a number of different modes, wherein each mode corresponds to a different output of the pump. The pump may have a plurality of pump chambers located within a pump housing. The pump chambers may be arranged in fluid communication with an inlet port and an outlet port. Each pump chamber may have a pumping device which draws in fluid from the inlet port during an intake stroke and pushes fluid through the outlet port during a discharge stroke. The pump may also have a plurality of electronically controlled valve assemblies which control the output of the pump. Each valve assembly can be selectively switched to a by-pass state for by-passing the fluid flowing from the pump chamber back to the inlet port during the discharge stroke of a pumping device. The pump may operate in a number of different modes which each have a distinct output. Each mode may be defined by which valves are chosen to be switched to their by-pass state.
    Type: Grant
    Filed: May 18, 1998
    Date of Patent: February 6, 2001
    Assignee: Sturman Industries, Inc.
    Inventor: Oded E. Sturman
  • Patent number: 6045334
    Abstract: A valve disabler for use in high pressure pipe cleaning systems. The valve disabler of the present invention serves to disable a single cylinder in a multi-cylinder plunger pump so as to generate pulsatile pressure surges within a hose member. The pulsatile pressure surges cause the distal end of the hose member to move in a serpentine manner, thus allowing the hose member to negotiate down a tortuous path within the pipe without stalling or becoming otherwise impeded.
    Type: Grant
    Filed: February 13, 1998
    Date of Patent: April 4, 2000
    Assignee: Hypro Corporation
    Inventors: Edward P. Murphy, Frank Amyotte
  • Patent number: 6042348
    Abstract: A protective shutter assembly for a fan of a forced air cooling system includes lightweight shutter members mounted for pivoting motion about vertical axes. When the fan is operative, its shutter members are pivoted in a first direction to expose the fan and allow air to be exhausted therefrom. When a fan is inoperative, its shutter members pivot in a second direction toward the fan and overlap to prevent air from being reversely drawn into the fan.
    Type: Grant
    Filed: May 11, 1998
    Date of Patent: March 28, 2000
    Assignee: Lucent Technologies Inc.
    Inventors: Nandakumar G. Aakalu, Woodly Maurice
  • Patent number: 5954484
    Abstract: A sewage lifting station having at least two solid waste collection chambers for receiving pumped solid waste-contaminated sewage. The station has a collection tank for receiving pre-treated waste water flowing from the solid waste collection chambers via connection pipes. Each solid waste collection chamber is connected to a pump to empty the collection tank via one of the connection pipes and solid waste collection chambers to pump the current of sewage into a pressure pipeline. There is a closing device connected to each connection pipe to selectively close an exit orifice in the connection pipe and open a connection to an operating pump to drain the collection tank. A control device alternately closes and opens the exit orifices with the closing devices so that an exit orifice allocated to an operating pump is closed and an exit orifice allocated to a non-operating pump is simultaneously and automatically opened.
    Type: Grant
    Filed: December 8, 1997
    Date of Patent: September 21, 1999
    Assignee: STRATE Technologie fur Abwasser GmbH
    Inventor: Wilfried Strate
  • Patent number: 5775880
    Abstract: A valve disabler for use in high pressure pipe cleaning systems. The valve disabler of the present invention serves to disable a single cylinder in a multi-cylinder plunger pump so as to generate pulsatile pressure surges within a hose member. The pulsatile pressure surges cause the distal end of the hose member to move in a serpentine manner, thus allowing the hose member to negotiate down a tortuous path within the pipe without stalling or becoming otherwise impeded.
    Type: Grant
    Filed: March 20, 1996
    Date of Patent: July 7, 1998
    Assignee: Hypro Corporation
    Inventors: David G. Vensland, Edward P. Murphy
  • Patent number: 5364240
    Abstract: A fluid pump having a casing defining a fluid inlet a fluid outlet and first and second cylinders, a first piston mounted to the casing for movement in first and second directions with the first piston causing fluid in the inlet to be drawn into the first cylinder as the first piston moves in the first direction and causing fluid in the first cylinder to be discharged from the first cylinder towards the outlet and the second cylinder as the first piston moves in the second direction, a second piston mounted to the casing for movement in third and fourth directions with the second piston being movable in a third direction without drawing significant amounts of fluid from the inlet into the second cylinder and causing fluid in the second cylinder to be discharged from the second cylinder towards the outlet as the second piston moves in the fourth direction, and structure for driving the first piston reciprocatively in the first and second directions and the second piston reciprocatively in the third and fourth
    Type: Grant
    Filed: October 14, 1993
    Date of Patent: November 15, 1994
    Assignee: Spartan Tool Div. of Pettibone Corp.
    Inventor: Roy W. Salecker
  • Patent number: 5289681
    Abstract: An oil pump which delivers an operating oil to a power steering mechanism of vehicle is designed to reduce the power which is wasted during a high speed operation. A subpump of a reduced capacity having a number of revolutions which varies with a vehicle speed is provided, in addition to a vane pump which delivers an operating oil to the power steering mechanism. A discharged oil from the subpump is delivered to act upon the rear surface of the vanes to enable a pumping action of the vane pump when operating at low speeds while the delivery of the discharged oil to the rear surface of the vanes is interrupted to cease the pumping action of the vane pump, and is delivered to the power steering mechanism when operating at higher speeds.
    Type: Grant
    Filed: December 31, 1991
    Date of Patent: March 1, 1994
    Assignee: Jidosha Kiki Co., Ltd.
    Inventor: Hiroto Iwata
  • Patent number: 5178520
    Abstract: A centrifugal or rotary double pump has a singular circular casing surmounting two motors driving individual rotors within the casing. Above a flat side of the casing is attachable to the device serviced by the double pump and receives an insert defining the inlet and outlet apertures and within the housing, defining two pump units each in conjunction with the respective rotor.
    Type: Grant
    Filed: June 20, 1991
    Date of Patent: January 12, 1993
    Assignee: Wilo-Werk GmbH & Co. Pumpen- und Apparatebau
    Inventor: Gunter Strelow
  • Patent number: 5167493
    Abstract: A positive-displacement type pump system, such as a fixed-cylinder type radial piston pump system, includes a common pump housing formed with a plurality of cylinders, and a plurality of pistons slidably received in the respective cylinders and cooperating therewith to form a plurality of pump units. A first throttle valve is disposed in a first suction passage of a first group of the pump units for operating a first actuator, for adjusting the flow rate of a working fluid to be supplied to the these pump units. A second throttle valve is disposed in a second suction passage of a second group of the pump units for operating a second actuator, for adjusting the flow rate of the working fluid to be supplied to the pump units of the second group independently from those of the first group. The pump units of the first and second groups can thus be individually adjusted in terms of the respective delivery volumes.
    Type: Grant
    Filed: November 14, 1991
    Date of Patent: December 1, 1992
    Assignee: Nissan Motor Co., Ltd.
    Inventor: Yuji Kobari
  • Patent number: 5147154
    Abstract: A pressure regulation apparatus, for a bi-directional pneumatic transportation system, has first, second, and third flow chambers with ports provided at two of the chambers. A pumping device alternatively pumps air from the chamber lacking a port to either of the ported chambers. An air dam cooperates with a valve assembly that responds to internal pressures induced by the pumping device to separate one of the ported chambers into sub-chambers and to selectively isolate one of the sub-chambers from the other to bi-directionally control air flow between the ports. The bi-directional pneumatic transportation system in accordance with the present invention incorporates such a pressure regulation apparatus to control transportation of an item between stations connected by a pneumatic tube network.
    Type: Grant
    Filed: April 8, 1991
    Date of Patent: September 15, 1992
    Assignee: Hamilton Air Products
    Inventor: Lowell Scott
  • Patent number: 5094597
    Abstract: A variable discharge pump comprises a plurality of pumping units, each pumping unit including an outlet port discharging a particular volumetric discharge of working fluid, a plurality of outlet passages respectively communicating the outlet ports of each of the pumping units. Each of the outlet passages includes a supply passage provided for supplying the working fluid to a driven apparatus and a reflux passage provided for returning the working fluid to a working fluid reservoir, both being branched from the outlet passage.
    Type: Grant
    Filed: April 25, 1990
    Date of Patent: March 10, 1992
    Assignee: Atsugi Unisia Corporation
    Inventors: Yoshiki Takai, Teruhiko Mochizuki
  • Patent number: 5050233
    Abstract: A rotary compressor includes first and second compressor sections, and a motor for driving the compressor sections. The first and second compressor sections have first and second cylinders, respectively, and each cylinders has a suction port. First and second suction pipes are connected to the suction ports, and first and second change over valves are provided at the first and second pipes, respectively. The first cylinder has a release port for releasing a port of the gas being compressed in the first cylinder. A release pipe provided with a third changed over valve is connected to the release port. The operaations of the first to third valves are controlled by a control circuit so that the capacity of the compressor varies in the plurality of steps in accordance with the loads applied thereto.
    Type: Grant
    Filed: May 25, 1988
    Date of Patent: September 17, 1991
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Toshiaki Hitosugi, Izumi Onoda
  • Patent number: 5004155
    Abstract: An agricultural sprayer of the injection type has a charging circuit for generating a pressurized circulating flow of fluid additive. This is supplied to the inlet of a metering pump of the variable stroke piston type. This allows the pump to operate at optimum volumetric efficiency throughout a wide range of pump speeds, for agricultural chemicals of all common viscosities and at all temperatures normally encountered. The speed of the metering pump can thus be controlled to control the amount of chemical injected into the water being sprayed.
    Type: Grant
    Filed: January 30, 1990
    Date of Patent: April 2, 1991
    Inventor: Norm Dashevsky
  • Patent number: 4801253
    Abstract: Instead of a hand-operated oil pump for supplying extra oil to the chain of a motor saw, two pumps according to the invention are disposed on the same shaft. The first one works always, while the second one can be switched on and off. The switching is effected by choking the feed of oil partly or completely to the second one. Both the pumps are controllable by decreasing the piston stroke.
    Type: Grant
    Filed: October 31, 1986
    Date of Patent: January 31, 1989
    Assignee: Aktiebolaget Electrolux
    Inventor: Jan-Erik Johansson
  • Patent number: 4787822
    Abstract: A volume control for a multi-nozzle rotary pump filling system in which a plurality of rotary pumps are driven from a common drive. Each pump is connected with its own nozzle by way of a connection that includes a volume control operable to adjust the back pressure on the rotary pump to thereby vary the amount of product dispensed by the nozzle. In case of more viscous products, a by-pass line which includes a relief valve is also provided between the inlet side of the control unit and the in-feed side of the pump.
    Type: Grant
    Filed: April 10, 1986
    Date of Patent: November 29, 1988
    Assignee: National Instrument Company, Inc.
    Inventor: Richard N. Bennett
  • Patent number: 4741674
    Abstract: In a system with parallel connected compressors, a suction and discharge manifold arrangement for isolating an inactive compressor from the rest of the operating system. A check valve in the discharge line of the compressor prevents fluid flow back into the discharge port from a common system discharge line when the compressor is de-energized. A normally closed, pressure actuated valve in the suction line of each compressor prevents fluid from flowing through the compressor suction port when the compressor is inactive. The valve is connected to the compressor's discharge line, and opens in response to the discharge pressure developed when the compressor begins to operate. Pressure and oil level equalizing lines interconnect the compressor oil sumps, conveying oil between compressors and equalizing pressure in the oil sumps.
    Type: Grant
    Filed: November 24, 1986
    Date of Patent: May 3, 1988
    Assignee: American Standard Inc.
    Inventor: James C. Tischer
  • Patent number: 4725204
    Abstract: Vacuum pumping system comprises a plurality of vacuum processing vessels, semiconductor processing reactors, and the like, connected to a common manifold evacuated by a generously large central vacuum unit. The manifold is maintained at a substantially constant designated pre-set pressure higher than the pressures within the reactors by means of a gas bleed inlet valve controllably feeding an inert gas into the manifold. A blower package with valving, interposed between each reactor and the common manifold, discharges directly into the manifold and prevents pressure surges and excursions in the manifold and reactors as well as permitting each reactor to operate at different pressures independently of the existing manifold pressure.
    Type: Grant
    Filed: November 5, 1986
    Date of Patent: February 16, 1988
    Assignee: Pennwalt Corporation
    Inventor: Harold R. Powell
  • Patent number: 4527959
    Abstract: A pump is provided for circulating drilling fluid and the like into a well during a well drilling process. The pump comprises a pair of double-ended piston assemblies hydraulically reciprocated in opposite directions by a common hydraulic drive arrangement, wherein each piston assembly has a relatively large piston at one end and a relatively small piston at an opposite end. The various pistons reciprocate within appropriately sized cylinders each having a working end with a one-way intake valve through which drilling fluid is drawn from a supply tank and a one-way discharge valve through which drilling fluid is discharged to the well.
    Type: Grant
    Filed: May 10, 1983
    Date of Patent: July 9, 1985
    Assignee: Whiteman Manufacturing Company
    Inventor: Marvin E. Whiteman
  • Patent number: 4411141
    Abstract: A parallel operation compressor type refrigerating apparatus is disclosed which has first and second compressors connected in parallel with each other by a pipe, each having the inside of its crankcase separated into a motor chamber and a compressing element chamber by a partition provided with a pressure equalizing opening and a lubricant equalizing nonreturn valve allowing lubricant passage only from the motor chamber side to the compressing element chamber side, and which comprises a means provided at the end of a suction pipe of a refrigeration cycle system to separate the refrigerant gas circulating within the suction pipe into a lubricant and a gas, a first branch pipe to supply a portion of said gas to the first compressor, a second branch pipe to supply the rest of the gas and the lubricant to the second compressor, a pressure and lubricant equalizing pipe connecting together the lubricant sinks of the two compressors, and a nonreturn valve provided in the pressure and lubricant equalizing pipe to blo
    Type: Grant
    Filed: December 30, 1981
    Date of Patent: October 25, 1983
    Assignee: Mitsubishi Denki Kabushiki Kaisha
    Inventor: Akira Hara
  • Patent number: 4179248
    Abstract: A pair of helical screw rotary hermetic compressor units are connected in parallel across common suction and discharge manifolds. The discharge manifolds open to each unit casing well above the level of accumulated oil within the bottom of the hermetic casings acting as oil sumps. Oil bleed lines are provided for the casings which open to the casing interior at oil bleed ports at the normal level of accumulated oil. The bleed lines are of small diameter and open directly to the discharge manifold at points downstream of the connection between the discharge manifold and the hermetic casing. Excessive accumulation of oil within one of the hermetic compressor casings causes the oil to bleed through its bleed line under a small pressure differential to the discharge manifold for redistribution to the remaining compressors.
    Type: Grant
    Filed: August 2, 1978
    Date of Patent: December 18, 1979
    Assignee: Dunham-Bush, Inc.
    Inventor: David N. Shaw
  • Patent number: 4140437
    Abstract: An apparatus for conveying liquids mixed with solid substances to a distance is disclosed, comprising a compressed air pump formed by two or more cylindrical chambers, each provided with an inlet valve for the liquid and with a connection for the inlet and discharge of compressed air, which is cyclically and alternatively fed into and expelled from the cylinders under the control of a proper distributor, the apparatus comprising a free surface loading hopper located upstream and above the pump body, having an outlet communicating with said inlet valves of the cylindrical chambers, whereby the flow rate of the liquid arriving to the hopper is continuously compensated so as to uniformly feed the liquid by gravity to the cylindrical chambers, the apparatus further comprising at least a spare cylindrical chamber adapted to be used in substitution for one of the normally operating cylindrical chambers, for servicing and/or maintenance purposes.
    Type: Grant
    Filed: June 28, 1976
    Date of Patent: February 20, 1979
    Inventor: Giovanni Faldi
  • Patent number: 4097198
    Abstract: This hydraulic engine utilizes two sets of hydraulic cylinders connected to a shaft so as to be alternately pressurized as the shaft is reciprocally driven by a pair of conventional internal combustion chambers. The outlets of all hydraulic cylinders are connected to a common output line via valves. During each power stroke certain of the hydraulic cylinders being pressurized are selectively disconnected (depressurized) from the output line. This effectively decreases the load on the driving chamber, and insures a relatively constant, high pressure hydraulic fluid output level despite changes in supplied force during each power stroke. The selective cylinder disconnection may be implemented programmatically in response to changes in engine parameters such as combustion pressure. The engine also includes a pump for supplying input hydraulic fluid to each set of cylinders while that set is not being compressed. The input fluid force is additive to the power supplied by the operative combustion chamber.
    Type: Grant
    Filed: November 15, 1976
    Date of Patent: June 27, 1978
    Inventor: Allen R. Herron