Independent Patents (Class 91/306)
  • Patent number: 11306590
    Abstract: An air motor assembly includes an exhaust block with an exhaust port that conveys exhaust air into an exhaust manifold. The exhaust port includes an expansion chamber that creates a pressure drop in the exhaust gas, thereby decreasing the temperature of the exhaust gas. The expansion chamber is defined between a first wall that is tangential to the air motor cylinder and a second wall that is transverse to an axis of the exhaust port. Poppet valves control actuation of a shuttle. The poppet valves are disposed on the exterior of the air motor assembly and are thermally insulated from the air motor assembly.
    Type: Grant
    Filed: January 11, 2019
    Date of Patent: April 19, 2022
    Assignee: Graco Minnesota Inc.
    Inventors: Martin P. McCormick, Benjamin J. Dauwalter, Kenneth C. Floer
  • Patent number: 11028860
    Abstract: A pressure booster having arranged therein drive cylinders on both sides of a boosting cylinder is provided with a pair of pilot valves that are actuated when pistons of the drive cylinders abut against the moving ends thereof. A pair of actuation valves switch the supply state of a pressure fluid to pressure chambers of the drive cylinders. When the pilot valves are actuated, the pressure fluid passes through the pilot valves and is supplied to the pair of actuation valves, and the supply state of the pressure fluid is switched.
    Type: Grant
    Filed: May 11, 2018
    Date of Patent: June 8, 2021
    Inventors: Yoshiyuki Takada, Kengo Monden, Kazutaka Someya
  • Patent number: 10920796
    Abstract: A hydraulic pressure intensifier (1) is described comprising a housing (2) having a low pressure chamber (3) and a high pressure chamber (4), force transmitting means (5) between the low pressure chamber (3) and the high pressure chamber (4), and a switching valve (8) connecting the low pressure chamber (3) to a first pressure or to a second pressure different from the first pressure. It is intended to have a large volume on the high pressure side of the pressure intensifier. To this end the switching valve (8) is controlled by a pilot valve 18.
    Type: Grant
    Filed: March 1, 2018
    Date of Patent: February 16, 2021
    Assignee: PistonPower ApS
    Inventors: Jorgen P. Todsen, Jorgen Mads Clausen, Tom Tychsen
  • Patent number: 9702350
    Abstract: A system, in certain embodiments, includes a compression cylinder configured to mount to a reciprocating compressor. The compression cylinder includes an intake port and a discharge port. The system also includes a piston assembly disposed within the compression cylinder. The piston assembly includes a piston, and a flow control member extending from the piston. The flow control member is configured to selectively block the intake port and the discharge port upon movement of the piston assembly relative to the compression cylinder.
    Type: Grant
    Filed: January 19, 2012
    Date of Patent: July 11, 2017
    Assignee: GE Oil & Gas Compression Systems, LLC
    Inventors: Omar M. Kabir, Karthik Ramakumar, Ken Ashraph
  • Patent number: 9458843
    Abstract: A pump arrangement comprising two pump units, each pump unit comprising a pumping cylinder, a reciprocally movable pumping piston, said pumping piston delimiting a pumping chamber in the pumping cylinder in communication with a pump port for fluids, an actuator connected to the pumping piston, and determining a value dependent on the position of the pumping piston in the pumping cylinder, said pump arrangement further comprises a inlet and delivery valves connecting the pump port of each pump unit to a source line and a delivery line for pumped fluids, wherein the pump arrangement comprises at least one regulating unit the flow of the pumped fluids based on the value dependent on the positions of the pumping pistons in the pump units. Also a system comprising such a pump arrangement and a method for pumping fluids in said pump arrangement.
    Type: Grant
    Filed: December 18, 2009
    Date of Patent: October 4, 2016
    Inventors: Erik Cardelius, Svante Bahrton, Markus Eklund, Kasper Höglund
  • Patent number: 9435322
    Abstract: A system, in certain embodiments, includes a compression cylinder configured to mount to a reciprocating compressor. The compression cylinder includes an intake port and a discharge port. The system also includes a piston assembly disposed within the compression cylinder. The piston assembly includes a piston configured to selectively block the intake port upon movement of the piston assembly relative to the compression cylinder.
    Type: Grant
    Filed: January 19, 2012
    Date of Patent: September 6, 2016
    Assignee: GE Oil & Gas Compression Systems, LLC
    Inventors: Karthik Ramakumar, Omar M. Kabir, Ken Ashraph
  • Publication number: 20100107863
    Abstract: An arm structure intended for controlling the impulse valve (5) of the oscillating cylinder which performs a back and forth movement whereupon the oscillating cylinder comprises a cylinder body (14), a cylinder chamber (1) formed into the mentioned body, a piston (2) which can be moved in the cylinder chamber with the help of a pressure media, feeding channels (15, 16, 17) of the pressure media to the cylinder chamber (1) and control devices in order to direct the pressure media to the cylinder chamber to various sides of the piston and away from the cylinder chamber in order to achieve a back and forth movement for the piston and whereupon the impulse valves (5) belong to the control devices the operation of which at least one arm (10); (12), which explores mechanically the position of the piston arm (7) the movement of which arm is adjusted to open the pressure relieving channel of the impulse valve (5).
    Type: Application
    Filed: November 13, 2007
    Publication date: May 6, 2010
    Inventor: Vesa Ropponen
  • Patent number: 7237470
    Abstract: A fluid power unit has a cylinder in a housing, a piston slidable in the cylinder and dividing the cylinder into a retract side and an extend side, and a two-position control valve. The control valve has a spool and first and second pilots. The position of the spool is responsive to the first and second pilots. There is a retract poppet valve in the retract side of the cylinder, and an extend poppet valve in the extend side. The retract and extend poppet valves are biased to a closed position. The retract poppet valve is in a fluid path between the retract side and the control valve; the extend poppet valve is in a fluid path between the extend side and the control valve. The alternate movement of the piston in the cylinder alternately opens and closes the poppet valves, The circuit connects the poppet valves to the pilots and alternately applies and releases pressure to the pilots, causing the spool of the control valve to shift and apply inlet pressure to the piston on alternate sides.
    Type: Grant
    Filed: July 7, 2005
    Date of Patent: July 3, 2007
    Assignee: Burns Controls Company
    Inventor: Patrick J. Burns, Sr.
  • Patent number: 6123008
    Abstract: A compact transportable compressed-air piston engine for paint-spraying devices, dosing pumps, grease guns or the like, makes it possible, without much effort, to carry out various length working strokes of a working piston. A compact engine is obtained by mounting the control in/on the cylinder head or in/on the cylinder bottom with axes extending transversely with respect to a main axis so that stroke changes can be achieved solely by the working piston contacting the valve piston rods of switch valves. In addition, return springs are not needed in the switch valves, which are required for reversing and are operated by the working piston.
    Type: Grant
    Filed: June 17, 1998
    Date of Patent: September 26, 2000
    Assignee: Wiwa Wilhelm Wagner GmbH & Co. Kg
    Inventor: Oswald Scherer
  • Patent number: 5944045
    Abstract: A circuit is provided for the circulation of solvent to and from a valve having a movable component and a housing for movably housing the movable component. The movable component has a first orientation with respect to the housing in which it permits the flow of a valved fluid from the valve through a first port provided on the valve and a second orientation with respect to the housing in which it permits the flow of the valved fluid from the valve through a second port provided on the valve. The circuit includes a first passageway provided between the movable component and the housing. A third port is provided on the housing for the introduction of the solvent into the housing and a fourth port is provided on the housing for removal of the solvent from the housing. The first passageway couples the fourth port to the third port. The solvent is a solvent for the valved fluid. A reservoir is provided for the solvent, along with conduits for coupling the third and fourth ports to the reservoir.
    Type: Grant
    Filed: May 3, 1995
    Date of Patent: August 31, 1999
    Assignee: Ransburg Corporation
    Inventors: Harold T. Allen, Edward T. Feldman, Varce E. Howe, Ghaffar Kazkaz, Ghazi M. A. Khattab, Jerry L. McPherson, Jr., James A. Scharfenberger
  • Patent number: 5862828
    Abstract: For the oscillating triggering of a double acting operating cylinder (4), a reversing valve (6) has been provided and has been inserted between the pressure supply connector (5) and the two operating cylinder drive connectors (2,3) that is driven via two NOT elements (7,8), that each have been assigned to an operating position and connected with a drive connector (2,3). The reversing valve (6) is caused by pressure to periodically switch between the two operating positions. In order to stop oscillating with a defined final position of the operating cylinder (4) or start it up again, at least one of the NOT elements (7) has been provided with a pressure supply connector that can be triggered independently from the supply connector (5).
    Type: Grant
    Filed: July 9, 1997
    Date of Patent: January 26, 1999
    Assignee: Hygrama AG
    Inventor: Erich N. Dorfler
  • Patent number: 5174322
    Abstract: A four-way hydraulic control valve automatically reverses flow of hydraulic fluid to a double acting hydraulic cylinder or to a reversible hydraulic motor when a substantial resistance to fluid flow is encountered, such as when the cylinder or a machine being operated by the cylinder or motor reaches a mechanical limit of its motion. The valve has a reciprocating spool in a valve body with two internal control valves, one at each end, and with appropriate internal pressure shunts for directing high pressure fluid into the control valves and drain fluid restrictions to shuttle the spool back and forth in response to an increase in pressure resulting from a substantial resistance to fluid flow.
    Type: Grant
    Filed: March 7, 1991
    Date of Patent: December 29, 1992
    Assignee: Town & Country Research & Development, Inc.
    Inventor: Clayton A. Melrose
  • Patent number: 5174731
    Abstract: A method and an apparatus for control of the movement of a control piston an air control valve for a compressed air-operated double diaphragm pump, wherein the control piston is moved between the end positions in a control cylinder having inlet bores and outlet bores for the compressed air. The control piston is adjusted by a control medium. The method includes initially maintaining the control piston in an end position by a holding device against the pressure of the control medium for a predetermined period of time or until a counterpressure reaches a predetermined pressure level. Subsequently, the control piston is moved with a pushing force which is always greater than the maximum frictional forces. The holding device operates independently of the movement of the pump diaphragm, preferably using elastically, magnetically, or electromagnetically operating structural elements. The control cylinder includes separate connections for a control medium for moving the control piston.
    Type: Grant
    Filed: December 28, 1989
    Date of Patent: December 29, 1992
    Assignee: DEPA Gesellschaft fur Verfahrenstecnik mit beschrankter Haftung
    Inventor: Gerardus Korver
  • Patent number: 4871302
    Abstract: A piston-driven down hole pump and a method for using the same to lift fluid on both its upstroke and downstroke. The pump is powered by a waste water injection pump. A drive piston connected to a production piston and three-way valve power the down hole pump through the steady flow of the power fluid from the injection pump. The power fluid is exhausted into the well annulus and rises to the surface comingled with the fluid.
    Type: Grant
    Filed: January 26, 1988
    Date of Patent: October 3, 1989
    Assignee: Milam/Clardy, Inc.
    Inventors: T. J. Clardy, Henry Meno
  • Patent number: 4846045
    Abstract: An air-operated expansible chamber motor comprising a cylinder having first and second end heads, a piston reciprocable in the cylinder, a spool valve for controlling the supply to and exhaust of air from opposite ends of the cylinder, a relay valve mounted in one of the end heads for controlling the spool valve, a pilot valve in each end head having a stem engageable by the piston for controlling the relay valve via pressurization and exhaust of a pilot line, and a bleed for feedback of pressure air to the pilot line.
    Type: Grant
    Filed: December 7, 1987
    Date of Patent: July 11, 1989
    Assignee: McNeil (Ohio) Corporation
    Inventors: Ayzik Grach, Thomas M. Arens
  • Patent number: 4830230
    Abstract: An improved portioning assembly adapted for use in the precise portioning of food or other products is provided which makes use of a double-acting piston and cylinder assembly shiftable between defined limits, with the stroke length of the piston being correlated with the quantity of dispensed portions. The preferred overall portioning assembly includes a hydraulically operated product pump coupled with the control piston and cylinder assembly for sequential product-dispensing movement thereof; movement of the control piston between spaced limits serves to actuate associated limit switches, the latter operating a valve for directing pressurized charges of hydraulic fluid to the hydraulic pumping chamber. If desired, a delay can be provided before the initiation of each product-dispensing stroke of the control piston.
    Type: Grant
    Filed: June 22, 1987
    Date of Patent: May 16, 1989
    Assignee: Marlen Research Corporation
    Inventor: Richard G. Powers
  • Patent number: 4827833
    Abstract: An adjustable axial piston pump in swash plate design is provided in which the piston support surface (swash plate) is formed in a semi-cylindrical rocker body, whose cylindrical surface is supported in a sliding manner in a hollow-cylindrical bearing box, in which case a pressure pocket recess is provided for hydrostatic relief of the bearing surface and it is connected with a pressure medium source, whereby this axial piston pump has one connection that is always a feed line connection and a second connection that is always a suction line connection and whereby the pressure pocket recess is located only the side of rocker body relative to the axis of rotation of the cylindrical drum on which the working pistons acted upon by feed pressure are supported.
    Type: Grant
    Filed: December 12, 1984
    Date of Patent: May 9, 1989
    Assignee: Linde Aktiengesellschaft
    Inventor: Walter Heyl
  • Patent number: 4680930
    Abstract: A hydraulic power and control system for operating a reciprocating hydraulic mechanism including pump means connected to the hydraulic mechanism, a continuous torque hydraulic motor, a direction control driven by the motor to sequentially direct hydraulic power fluid to separate inlets of the mechanism, an escapement for restraining the motor at intervals of rotation for sequentially holding the direction control at two separate positions, one for supplying one inlet and the other for supplying the other inlet of the mechanism, and hydraulic limit valves for controlling the escapement when a reciprocating member of the mechanism reaches the end of each stroke. One embodiment has two constant volume hydraulic pumps connected with the hydraulic mechanism through a reversing valve assembly operated by a scotch yoke connected with the escapement.
    Type: Grant
    Filed: December 5, 1983
    Date of Patent: July 21, 1987
    Assignee: Otis Engineering Corporation
    Inventor: William W. Dollison
  • Patent number: 4496294
    Abstract: The present invention provides for an improved diaphragm pump having two material pumping chambers. The material pumping chambers are operated by two working fluid chambers which are separated from the material pumping chambers by two diaphragms. The diaphragms are interconnected to provide that the two material pumping chambers alternatively receive and discharge the material to be pumped. A control valve controls the stroke reversal of the improved diaphragm pump. The control valve is actuated by the pressurized working fluid which is being discharged from a pressurized fluid chamber. Further valving provides for a portion of the pressurized working fluid being discharged from a pressurized fluid chamber to be reused and introduced into the exhausted fluid chamber to initiate expansion of the exhausted fluid chamber. The pre-pressurization of the exhausted fluid chamber reduces the amount of source air required at the beginning of the stroke.
    Type: Grant
    Filed: December 21, 1982
    Date of Patent: January 29, 1985
    Assignee: Champion Spark Plug Company
    Inventor: Jozsef Frikker
  • Patent number: 4494574
    Abstract: A diaphragm pump pumping arrangement includes two diaphragm pumps which are arranged and operate in tandem. Each of the diaphragm pumps includes a housing and a movable wall that includes a flexible diaphragm and subdivides the interior of the respective pump housing into a pumping chamber and an actuating chamber. An air distributing control arrangement interposed between and connected to the pump housings includes a spool valve movable in a bore of an aluminum casing of the control arrangement between two end positions in which it alternatingly achieves the admission of the compressed air into one, and discharge of the air from the other, actuating chamber.
    Type: Grant
    Filed: December 23, 1983
    Date of Patent: January 22, 1985
    Assignee: International Telephone and Telegraph Corporation
    Inventors: Joseph C. Casilli, Lawrence Gibson, William D. Hessler
  • Patent number: 4492147
    Abstract: A reciprocatory air motor has a main plunger valve the position of which controls the flow of air to opposite sides of a main motor piston. Positioning of the plunger valve is itself controlled by a pair of cushion pistons carried on the piston rod of the motor. A space between the cushion pistons is used for the compression of air to effect absorption of the kinetic energy of the moving parts of the motor at opposite ends of the stroke.
    Type: Grant
    Filed: December 30, 1983
    Date of Patent: January 8, 1985
    Assignee: Knapp Pneumatics, Inc.
    Inventor: Wallace C. Knapp
  • Patent number: 4491055
    Abstract: The pump or pumps for supplying fluid to the two ends of a double-acting cylinder include a direction control, such as a direction control valve, shiftable between extend and retract conditions. A drive mechanism for the direction control includes a rotary hydraulic motor and a driven rotary drive mechanism for shifting the direction control. Hydraulic fluid is supplied to the drive motor through parallel connected start and stop valves. The start valve is opened in response to the movements of the hydraulic cylinder toward a stroke limit. The stop valve is operated in response to the shifting of the direction control, so that the motor is operated intermittently to reverse the direction control when the cylinder reaches the limit of an extend or retract stroke. The stop valve is controlled by the drive mechanism in timed relation with the shifting of the direction control. The start valve may be closed by that drive mechanism in timed relation with the opening of the stop valve.
    Type: Grant
    Filed: November 2, 1981
    Date of Patent: January 1, 1985
    Assignee: Otis Engineering Corporation
    Inventor: William W. Dollison
  • Patent number: 4456438
    Abstract: The invention concerns an extrusion device for impregnating rock formations preferably for bonding with a liquid synthetic product, with the use of a piston pump having at least one working cylinder. During the induction or suction stroke a working piston is filled with the extrusion liquid or with one of its components, and is emptied during the delivery stroke cycle. The working piston is controlled by a pump drive equipped with at least one driving cylinder and a driving piston which can be pressurized on both sides of the piston sequentially. A control valve pressurizes the piston surface with a working fluid as the other working surface of the piston is relieved. The extrusion device, can operate with more efficient utilization of the energy source applied and in particular with extremely high operating pressure of the available hydraulic medium, which is already available but used for other purposes, i.e., the operation of the rams or the hydraulic face- and/or roadway supports.
    Type: Grant
    Filed: April 29, 1982
    Date of Patent: June 26, 1984
    Inventors: Manfred Fischbach, Rolf Hebben
  • Patent number: 4452573
    Abstract: A chemical pump actuator utilizes a variable pilot for operation of the piston power unit and an attached chemical injector. The pilot structure includes a pair of valve assemblies for regulating the flow of a power fluid into and from the piston cylinder. Pressurization and depressurization of the diaphragmmatic pilot, as regulated by a control fluid flow independent of the power fluid flow, operates the power fluid inlet and outlet valve assemblies. This pressurization and depressurization of the pilot is regulated by control fluid inlet and outlet valve assemblies, these assemblies being cam actuated by the piston upon completion of the power and return strokes. Exhaust of the power fluid from the cylinder is regulated by a throttle assembly with the length of the stroke of the piston determined by a stroke control assembly. Accordingly, the piston cyclic rate and stroke can be independently adjusted presenting a pump actuator capable of a finely tuned control of the chemical injector attached thereto.
    Type: Grant
    Filed: February 18, 1982
    Date of Patent: June 5, 1984
    Assignee: Western Chemical Pumps, Inc.
    Inventor: William H. Samuel
  • Patent number: 4449896
    Abstract: The hydraulic operated surface pumping unit of this invention is a counterbalanced cross beam type pumping unit driven by a hydraulic cylinder. The pumping unit can be operated in a first mode of equal upstroke and down stroke speeds or in a second mode of slower upstroke and faster down stroke speeds. The stroke lengths are controlled by cams and are adjustable over a large range. Stroke cycle speeds can be varied by adjusting the output rate of a hydraulic pump used to drive the system. The main hydraulic valve includes intermediate lock positions to hold the pumping unit steady during phase shifts between upstrokes and down strokes and during shut down of the pumping unit. Pressure indicators are provided for optimum counterbalancing of the pumping unit, and a needle valve control for return fluid flow to tank is provided for slow let down of the pump rod for initial tag out settings.
    Type: Grant
    Filed: September 14, 1981
    Date of Patent: May 22, 1984
    Assignee: Energy 2000, Inc.
    Inventors: Robert Klepper, Daryld W. Bomar
  • Patent number: 4438628
    Abstract: A pump jack drive apparatus includes a pair of hydraulic cylinders connected to a walking beam of the pump jack for reciprocating the horsehead, and a pair of microswitches or proximity switches which are closed by the walking beam at the limits of the stroke thereof for controlling such stroke. The cylinders are driven and controlled by a pump and control unit which includes a valve for feeding hydraulic fluid to one or the other of the hydraulic cylinders, a control cylinder for controlling the valve, and two solenoid operated control valves for controlling movement of the control cylinder in response to closing of the switches by the walking beam.
    Type: Grant
    Filed: December 19, 1980
    Date of Patent: March 27, 1984
    Inventor: Reginald D. Creamer
  • Patent number: 4398463
    Abstract: A drive for the doctor blade of a gravure type printing press oscillates the doctor blade in a non-repeating motion. A doctor slide is coupled to the doctor blade, and oscillated on the frame by a first piston-cylinder unit. A pneumatic valve slide is driven back and forth on the frame by a second piston cylinder unit, between a first pair of end stops mounted on the doctor slide and between a second pair of end stops mounted on the frame. Upon engagement of the end stops on the doctor slide, the valve slide provides a pressure signal to reverse the direction of motion of the doctor slide. Upon engagement of the end stops on the frame, the valve slide provides a pressure signal to reverse its own direction of motion on the frame.
    Type: Grant
    Filed: August 19, 1981
    Date of Patent: August 16, 1983
    Assignee: Motter Printing Press Co.
    Inventor: Ralph A. Yessler, II
  • Patent number: 4381180
    Abstract: This invention provides a double-acting, double diaphragm pump particularly for fluids such as chemical compounds. The pump employs adjustable disk members mounted on a reciprocable rod connecting and actuating the diaphragms. These disks alternately engage the extending shaft of a pilot valve to move the valve and redirect the flow of pressurized fluid therethrough. The pressurized fluid behind the diaphragm is now caused to flow to a slide valve and cause it to be moved to an opposite limit. The slide valve is cycled by the pilot valves as the disks on the reciprocated rod engage the pilot valves. Each pump half has the exterior wall member disposed to carry two one-way valves, one valve to inhibit inward flow to the chamber and one valve to inhibit flow from the chamber.
    Type: Grant
    Filed: July 13, 1981
    Date of Patent: April 26, 1983
    Inventor: John R. Sell
  • Patent number: 4373425
    Abstract: Hydraulic engine with piston moving inside a chamber, the working and reversing controls being inside the piston.Said engine comprises a piston (6) which is provided with an annular chamber (15) into which the fluid is admitted through two conduits (13 and 14). From said chamber (15), the fluid passes through the conduit (17), the groove (19) and the conduit (21) and then through the reversing valve (22a) and from there via the conduits (28,29) into the lower chamber (2a). The fluid contained into the upper chamber (2b) is removed through the conduits (30 and 31) traverses the valve (22a) and arrives through the conduit (32) into the groove (33). It is then removed through the conduit (34) and the chamber (35) surrounding the column (4) towards two exhaust channels (37 and 36).This engine finds an application in driving the slide valve of a self-cleaning filter.
    Type: Grant
    Filed: July 1, 1980
    Date of Patent: February 15, 1983
    Inventor: Georges Moatti
  • Patent number: 4334837
    Abstract: A diaphragm air pump assembly pneumatically associated with a vacuum source and an atmospheric air source, comprises two diaphragms interconnected by a vertically extending rod to define two vacuum operational chambers and two pump chambers, two valves for controlling the alternative admission of vacuum to the vacuum operational chambers, and two normally closed valves operable in response to movement of the diaphragms in unison with the rod, each of two corresponding constituent parts being disposed and mounted in a symmetrical arrangement with respect to the central axis of the pump assembly. When the diaphragms are moved in one direction, one of two normally closed valves is opened to admit the vacuum into one of two vacuum operational chambers while admitting atmospheric air into the other vacuum operational chamber.
    Type: Grant
    Filed: January 17, 1980
    Date of Patent: June 15, 1982
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Masami Inada, Yasuhiro Kawabata, Noriyoshi Shibata
  • Patent number: 4329123
    Abstract: A diaphragm air pump assembly in pneumatic association with a vacuum source and an atmospheric air source includes therein two vacuum operational chambers and two pump chambers defined by two interconnected diaphragms upon admission of vacuum to one of the vacuum operated chambers and atmospheric air to the other vacuum operated chamber the diaphragms are moved in one direction due to pressure difference thereby compressing and exhausting the air contained in one of the pump chambers as well as opening one of two normally closed valves. The vacuum is thus admitted into the other vacuum operational chamber while atmospheric air is supplied to one vacuum operated chamber, so that the diaphragms are moved in the other direction thereby compressing and exhausting the air contained in the other pump chamber as well as opening the other normally closed valve. A periodical reciprocation of the diaphragms will accomplish the pumping operation.
    Type: Grant
    Filed: January 17, 1980
    Date of Patent: May 11, 1982
    Assignee: Aisin Seiki Kabushiki Kaisha
    Inventors: Yasuhiro Kawabata, Noriyoshi Shibata
  • Patent number: 4289063
    Abstract: A hydraulic driving device of a circuit breaker which opens and closes a system in response to two signals is principally constructed of a cylinder, a piston, and a main control valve for controlling the motion of the piston. A spool adapted to slide within the main control valve has its motion controlled by four pressure faces. The first pressure face is normally subjected to a high oil pressure. The second pressure face receives a low oil pressure upon application of the first signal, and a high oil pressure upon release thereof. The third pressure face receives a high oil pressure upon application of the second signal, and a low oil pressure upon release thereof. A high or low oil pressure acts on the fourth pressure face in correspondence with the piston motion. The magnitudes of the forces on the respective pressure faces of the spool are set in a predetermined relationship.
    Type: Grant
    Filed: July 6, 1978
    Date of Patent: September 15, 1981
    Assignee: Hitachi, Ltd.
    Inventor: Ichiro Nakamura
  • Patent number: 4281852
    Abstract: A motion converting system is configured for operating a vehicular jacking mechanism having a jacking member and a shaft rotatable for actuating the jacking member. The system comprises a sleeve for receiving the shaft which is then coupled to the sleeve, as through a transmission. The system includes a pneumatic cylinder. An actuator rod extends from the cylinder axially normal to the sleeve and is reciprocal toward and away from the sleeve, which carries a toothed wheel. Lever arms, arranged in pairs on opposite faces of the toothed wheel, extend radially outward from the sleeve and have proximal ends swingable about the sleeve. Pairs of links respectively interconnect distal ends of the lever arms with the end of the actuator. Selectively reversible pawls carried between pairs of the lever arms engage teeth of the toothed wheel to cause rotation of the sleeve for rotating the shaft in a selected continuous direction upon each movement of the actuator rod.
    Type: Grant
    Filed: April 25, 1979
    Date of Patent: August 4, 1981
    Inventor: Raymond L. Konkle
  • Patent number: 4242940
    Abstract: A fluid operated control device which co-operates with reciprocating means, such as a pneumatically driven shaft. The device includes a main cylinder and piston backed at each end by valves which each include auxiliary cylinders and pistons. The valves provide signal inlets and outlets which can be cross connected to cause continuous reciprocation of the main piston. Alternatively, the valves are operated to displace the main piston selectively or are connected to a delay to vary the timing sequence. Stroke adjustment is possible by a rod attached to one of the auxiliary valves. The main piston is mounted on a shaft passing through the other auxiliary valves.
    Type: Grant
    Filed: October 17, 1977
    Date of Patent: January 6, 1981
    Inventor: Victor J. Page
  • Patent number: 4242057
    Abstract: A diverse fluid pump assembly including a pair of parallel, reciprocating piston-cylinder, motor-pump combinations. The motor-pump combinations are oppositely arranged so that one is pumping while the other is charging. Motor reversal is accomplished through a unique, hydraulically actuated spool valve which is slaved to the common piston rods of the respective, tandem motor-pump combinations. The invention is intended for use primarily as a mud pump for oil well servicing or drilling rigs. Principal components are easily broken down for replacement because of wear and/or size considerations. In a preferred embodiment, the hydraulically actuated spool valve is hydraulically slaved to the motors to effect motor reversal. A unique floating stuffing box is provided on the motor side of each combination which accomodates lateral rod shifting while maintaining a fluid tight seal. The spool valve operates smoothly through five distinct stages during motor reversal thus eliminating any need for a pulsation dampener.
    Type: Grant
    Filed: September 24, 1979
    Date of Patent: December 30, 1980
    Inventor: Emil A. Bender
  • Patent number: 4181066
    Abstract: An air motor comprising a cylinder, a piston, and a valve mechanism for controlling the supply and exhaust of air to and from opposite ends of the cylinder, the valve mechanism comprising a D-valve and an actuator for the D-valve operable by the pressure air for driving the piston, movement of the actuator being controlled by valves at opposite ends of the cylinder for exhausting air from opposite ends of the actuator, these exhaust valves being operated by the piston, and the motor having means operable by the piston at each end of its stroke for restricting the exit of air from the cylinder to cushion the piston and prevent it from striking the ends of the cylinder.
    Type: Grant
    Filed: February 10, 1978
    Date of Patent: January 1, 1980
    Assignee: McNeil Corporation
    Inventors: Clarence E. Kitchen, Jerome B. Wegmann
  • Patent number: 4161308
    Abstract: A pump for injecting metered amounts of liquid into a line or a conduit, which includes a reciprocating pumping piston in a cylindrical chamber having an inlet and an outlet, both of which are controlled by check valves, wherein the pumping piston is driven by a pneumatic motor of the reciprocating type and having a cylinder in which is located a power piston that is suitably connected to the pumping piston. A switching valve assembly is provided for controlling a supply of power gas or air to the pneumatic motor and which responds to the movement of the pumping and power pistons for effecting reciprocal movement of the pistons.
    Type: Grant
    Filed: June 9, 1977
    Date of Patent: July 17, 1979
    Assignee: Vapor Corporation
    Inventors: Robert R. Bell, William H. Alexander
  • Patent number: 4104008
    Abstract: A fluid-actuated, such as a pneumatically actuated, hydraulic pump of either the single acting or the double acting type is controlled in its operation by a main valve member which has two connecting compartments the fluid in one of which is always at the atmospheric, and in the other always at a superatmospheric, pressure. The main valve member has two end faces, one larger than the other, the smaller being always acted upon by the superatmospheric pressure of the fluid and the larger one intermittently. An auxiliary valve member controls the admission of the pressurized fluid to the larger end face and is open only during the reversal of the hydraulic pump from suction to pumping stroke, while the pressure acting on the larger end face is relieved during reversal from the pumping to the suction stroke. A duct communicates one or the other of the connecting compartments of the main valve member which an actuating compartment of an actuating unit, depending on the position of the main valve member.
    Type: Grant
    Filed: June 9, 1977
    Date of Patent: August 1, 1978
    Assignee: Schmidt Kranz & Co.
    Inventors: Ernst Hoffmann, Siegfried Reimann, Heinz Aschermann
  • Patent number: 4050356
    Abstract: An apparatus for the control of a fluid medium incorporating a fluid medium actuated switching element which can be reversed between two switching positions by means of two actuation elements working in the opposite sense. The actuation line or conduit of each actuation element is controlled by a normally closed shutoff valve, each actuation element is connected at its actuation line between the shutoff valve and a throttle location.
    Type: Grant
    Filed: March 7, 1975
    Date of Patent: September 27, 1977
    Assignee: Haeny & Cie AG
    Inventors: Hans Jaggi, Hans Heimgartner
  • Patent number: 3991574
    Abstract: A fluid pressure power plant which converts heat energy, externally generated, to high hydraulic pressure. The system generates heat energy in the form of steam or hot gas, supplies the heat energy to a double-acting intensifier piston which converts the heat energy to high hydraulic pressure which is stored in an accumulator. The high pressure hydraulic energy stored in the accumulator is used to drive hydraulic motors or turbines through hydraulic output control valves. The system operates on a demand cycle in that no energy input from the heat generator and power conversion piston is necessary until there is some demand for power output from the hydraulic accumulator, once said accumulator is fully charged.
    Type: Grant
    Filed: February 3, 1975
    Date of Patent: November 16, 1976
    Inventor: Larry Vane W. Frazier
  • Patent number: 3963383
    Abstract: The device is an air driven piston in a cylinder driving a pump. A shuttle valve is provided to control the admission of air under pressure to, and exhaust from the cylinder. The shuttle valve is a double ended piston operating in coaxial bores with a stem part of smaller diameter between the ends. The air passes to the cylinder through the bore around the intermediate part of the double ended shuttle valve. The piston at one end of the shuttle valve has greater area exposed to pressure than the area of the piston on the other end of the valve. The shuttle valve is operated by one or more pilot valves that are actuated by the main piston. The shuttle valve is shifted by controlling the pressures acting on the parts of the pistons having exposed areas of different sizes.
    Type: Grant
    Filed: August 13, 1974
    Date of Patent: June 15, 1976
    Assignee: Haskel Engineering & Supply Co.
    Inventor: David C. Hill
  • Patent number: 3943823
    Abstract: A system for controlling a reciprocable double acting air motor including a pair of power valves for reversing the inlet and exhaust air to and from opposite sides of the piston in the air motor. The control apparatus includes a pair of snap opening pilot valves which are unseated in response to momentary mechanical engagement with the piston of the air motor and which are then pneumatically shifted open so that the energy to effect the pilot valve shift is derived from the air supply line and not from the air motor piston. The return of the pilot valves to the closed position is in response to pressure reversal in the air motor. The power valves each include a pair of chokes, one of which is continuously operable and is of moderate flow restriction and the other of which is intermittently operable and is of high flow restriction.
    Type: Grant
    Filed: June 13, 1974
    Date of Patent: March 16, 1976
    Assignee: Nordson Corporation
    Inventor: Simon Z. Tammy