Feedback Linkage Controls Variable Displacement Pump Patents (Class 60/391)
  • Patent number: 9470306
    Abstract: The invention is provided with an operation lever one end side of which is supported by the trunnion axis so as to be incapable of relative rotation and which is configured to be capable of rotating the trunnion axis, a follower lever a middle portion of which is supported by the trunnion axis so as to be capable of free relative rotation, and a detection switch. For the operation lever, a link for operating the operating lever is connected to the middle portion thereof so that, when rotated by the link, the other side end portion of the operating lever comes into tactile contact with other side end portion of the follower lever so as to rotate the follower lever in order to on/off the detection switch.
    Type: Grant
    Filed: January 9, 2013
    Date of Patent: October 18, 2016
    Assignee: YANMAR CO., LTD.
    Inventors: Yasuhiro Ikegami, Sadahiro Hara
  • Patent number: 7353651
    Abstract: A zero turning radius mower has a dual hydrostatic pump with right and left pump arms. A linkage between the pump arms and a pair of control levers destrokes both sides of the pump simultaneously if engine speed drops below a specified value. The linkage allows each pump arm to have a first stroke range if the engine powering the pump is above the specified value, and a second smaller stroke range if the engine powering the pump is below the specified value.
    Type: Grant
    Filed: September 22, 2005
    Date of Patent: April 8, 2008
    Assignee: Deere & Company
    Inventors: Brian Matthew Adkins, Kevin Patrick Lund
  • Patent number: 6038979
    Abstract: The present invention is a process and material for forming warhead casin The material itself consists of tightly wound carbon fiber bonded by a low temperature (room temperature) resin. This process of formation gives several advantages, including the ease of manufacturing and the elimination of the need to do inside threading as the interior of the casing can be totally formed during winding of the carbon thread. This also increases the speed of the formation process. The use of carbon thread and low temperature resins also gives several key advantages. First, the low temperature aspect of the resin allows the resulting casing to break down at temperatures significantly less than the ignition point of the munitions held within it. Because the fibers tend to separate as the ambient temperature increases, the casing will auto-ventilate at high temperatures. Additionally, since the casing is formed from carbon fibers, it maintains a high tensile strength while minimizing the weight of the casing.
    Type: Grant
    Filed: July 7, 1997
    Date of Patent: March 21, 2000
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Fred W. Watson, Wayne Hannock, Robert Lam, George Evans
  • Patent number: 5735114
    Abstract: A device for safely attaching sections of a rocket motor is disclosed. The device is constructed such that if the temperature of the rocket motor is elevated to the point where ignition of the propellant within the rocket motor becomes a significant danger, the device allows the sections of the motor to disengage. The device comprises a bimetallic retaining ring which either contracts or expands in diameter upon heating. The retaining ring is positioned in such a manner as to lockingly engage two sections of the rocket motor at normal temperatures. At elevated temperatures, however, the expansion or contraction of the bimetallic retaining ring causes the sections of the motor to unlock from one another, such that if the propellant ignites the sections will disengage and the rocket will be rendered non-propulsive.
    Type: Grant
    Filed: August 15, 1991
    Date of Patent: April 7, 1998
    Assignee: Thiokol Corporation
    Inventor: Warren W. Ellingsen
  • Patent number: 5311820
    Abstract: A heat sensitive case/nozzle interface is provided for an insensitive propellant-loaded munition such that the interface loses its structural integrity when high external heat is applied. The joint between a rocket case housing a rocket motor and nozzle forming the interface is received by an internal spring retainer positioned in a first groove in the case or nozzle in cooperation with a fusible material housed in an aligned second groove in the nozzle or case, respectively. A plurality of aligned openings extend into said first and second grooves. When the rocket is exposed to a high ambient temperature greater than melt temperature of the fusible material but lower than the auto-ignition temperature of the rocket, the fusible material melts and is forced through said holes by the spring retainer permitting the nozzle to separate from the case rendering the rocket motor safe if it auto-ignites.
    Type: Grant
    Filed: January 17, 1991
    Date of Patent: May 17, 1994
    Assignee: Thiokol Corporation
    Inventor: Warren Ellingsen
  • Patent number: 5277269
    Abstract: An engine revolution speed control device according to the present invention comprises: a hydraulic pump (1) which is driven by an engine (21); a hydraulic motor (4) for vehicle movement which is driven by oil expelled from the hydraulic pump (1) during vehicle movement; an actuator (52) for working which is driven by the oil expelled from the hydraulic pump (1) during the working state; a vehicle driving pedal (6) which during vehicle movement controls vehicle speed according to its amount of operation; a means (33) for speed reduction decision which makes a decision as to whether the amount by which the vehicle driving pedal (6) is depressed is being reduced; and a means for revolution speed control (33).
    Type: Grant
    Filed: November 17, 1992
    Date of Patent: January 11, 1994
    Assignee: Hitachi Construction Machinery Co., Ltd.
    Inventors: Kazuhiro Ichimura, Seiji Tamura, Akira Tatsumi, Mitsuo Kihara, Junichi Hosono, Kazuo Asano
  • Patent number: 5036658
    Abstract: A rocket motor that has a solid propellant with closure means that is secd to the rocket motor housing by heat responsive means that melts before the solid propellant ignites to prevent the rocket motor from becoming propulsive when subjected to excessive external heat sufficient to cause the rocket propellant to ignite.
    Type: Grant
    Filed: March 5, 1990
    Date of Patent: August 6, 1991
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventor: John M. Tate
  • Patent number: 4909028
    Abstract: The invention relates to a pressure-relief device in a PFBC power plant with a combustor (12) enclosed in a pressure vessel (10). The device is intended to limit the pressure difference between the combustor (12) and the surrounding space (22) in the pressure vessel (10) and to initiate pressure relief of the pressure vessel (10) out into the atmosphere. Via a conduit (54) with a rupture disc (56), the combustor (12) communicates with one or more blow-off valves (42). If the rupture disc (56) bursts, a sensor (62) indicates this and effects opening of the blow-off valve (42) via signal processing and operating equipment (64). Between the rupture disc (56) and the combustor (12) a perforated diaphragm (60) is provided. In the space between this diaphragm and the rupture disc (56) a layer of particulate, heat-insulating material (58) is provided, which restricts the heating of the rupture disc (56).
    Type: Grant
    Filed: March 3, 1989
    Date of Patent: March 20, 1990
    Assignee: ABB Stal AB
    Inventors: Renzo Cetrelli, Nils Endahl
  • Patent number: 4838209
    Abstract: A PFBC power plant, with a vessel containing hot gas considerably exceeding the atmospheric pressure and a blow-off device for rapidly emptying a container containing the hot gas. The blow-off device comprises a heat exchanger which is located between the hot gas vessel and a valve in the blow-off device. Heat-absorbing material in the heat exchanger absorbs heat in the hot gas and reduces the temperature in the gas so as to protect the blow-off valve against thermal shock.
    Type: Grant
    Filed: April 14, 1988
    Date of Patent: June 13, 1989
    Assignee: ABB Stal AB
    Inventor: Lennart Hjalmarsson
  • Patent number: 4825644
    Abstract: A ventilation system for a nacelle 14 is disclosed. The ventilation system includes pressure relief doors 50 and 52, and a holdback device 68 which blocks each open door from moving from the open position to the closed position.
    Type: Grant
    Filed: November 12, 1987
    Date of Patent: May 2, 1989
    Assignee: United Technologies Corporation
    Inventors: Robert Bubello, Jeffrey L. Ream
  • Patent number: 4667472
    Abstract: This invention relates to integrated electro-hydraulic actuators for use aboard aircraft or elsewhere. A balanced, double-acting hydraulic ram or motor (12) is connected between a support (16) and a member to be moved relative to the support. The ram includes first and second changeable volume hydraulic chambers (30, 32). A reversible hydraulic pump (38) is connected by a pair of conduits (44, 46) to the ram chambers (30, 32). The pump (38) displaces hydraulic fluid from one chamber to another for the purpose of causing a pressure differential between them. A hydraulic accumulator (60) provides leakage makeup fluid to the actuator, and further provides a quiescent pressure to the actuator when it is in a substantially nonoperative condition. A conduit (62) may connect the accumulator (60) to the ram (12). A laminar leakage flow path within the actuator permits hydraulic connection of the accumulator (60) to the ram (12) without use of valves.
    Type: Grant
    Filed: December 28, 1984
    Date of Patent: May 26, 1987
    Assignee: The Boeing Company
    Inventors: C. William Clay, Curtiss W. Robinson
  • Patent number: 4630441
    Abstract: This invention relates to small-sized electrohydraulic actuators for use in adjusting aircraft control surfaces. A problem associated with such actuators is that they must be of a light-weight and efficiently packaged design. The present invention is designed to operate at relatively low hydraulic pressures. A balanced, double-acting hydraulic ram (10), connectable between a support (14) and a member to be moved relative to the support, includes a cylinder (18) divided into first and second chambers (20, 22) by a movable piston (19). A pump (26) having high and low pressure ports (38, 40) is connected to the cylinder (18) by first and second conduits (42, 44). A third conduit (48) connects an accumulator (46) to the first and second conduits (42, 44). A valve (52) is positioned in the third conduit (48), and blocks high pressure flow from a high pressure port in the pump to the third conduit (48).
    Type: Grant
    Filed: September 4, 1984
    Date of Patent: December 23, 1986
    Assignee: The Boeing Company
    Inventor: Theron R. Chamberlain
  • Patent number: 4542802
    Abstract: A control system is provided for a combine or other vehicle having an engine for driving both the ground wheels of the vehicle and at least one auxiliary mechanism, such as the crop-processing mechanisms of a combine. The engine is coupled to the ground wheels through a hydrostatic transmission, and the power takeoff for the auxiliary mechanism is located on the engine side of the transmission. A speed droop governor regulates the fuel input to the engine in response to changes in the engine speed. Transmission control means adjusts the setting of the hydrostatic transmission, and thus the load applied to the engine via the transmission, in response to changes in engine speed or another parameter that varies with engine load so as to control the speed changes effected by the droop governor.
    Type: Grant
    Filed: July 27, 1984
    Date of Patent: September 24, 1985
    Assignee: Woodward Governor Company
    Inventors: Daniel C. Garvey, Richard D. Fiolkoski
  • Patent number: 4498286
    Abstract: A gas turbine plant comprises a compressor, a turbine and, therebetween, a pressurized container containing a combustion chamber with a fluidized bed. The plant further comprises a valve means for shutting off the compressor and the turbine, respectively, from the combustion chamber at a sudden load drop out and a valved by-pass duct for direct connection of the compressor and the turbine.At a rapid load drop out, when the valve means are operated to shut off the combustion chamber from the compressor and the turbine and there is a direct connection between the compressor and the turbine, the fluidized bed of the combustion chamber is passivated, by short-circuiting, by means of a further valve means which connects the pressurized container supplying combustion air to the inlet side of the combustion chamber with the outlet side of the combustion chamber, so that the fluidized bed collapses and the air flow through it is interrupted.
    Type: Grant
    Filed: June 9, 1983
    Date of Patent: February 12, 1985
    Assignee: Stal-Laval Turbin AB
    Inventors: Roine Brannstrom, Sven-Erik Kreij
  • Patent number: 4498285
    Abstract: A gas turbine plant includes a compressor and a turbine and therebetween a pressurized combustion chamber with a fluidized bed arranged within a pressurized container. The plant is also provided with valves for shutting off the compressor and the turbine from the combustion chamber upon a sudden load drop out and a valved by-pass duct for direct connection of the compressor and the turbine. To rapidly release the pressure in the combustion chamber when there is a direct connection between the compressor and the turbine, hot gas from the fluidized bed and colder compressed air from the container are mixed in a mixing chamber prior to discharge into the surroundings. In this way, the blow-off valve is protected from very hot gases which would damage it.
    Type: Grant
    Filed: June 9, 1983
    Date of Patent: February 12, 1985
    Assignee: Stal-Laval Turbin AB
    Inventor: Sven-Erik Kreij
  • Patent number: 4483663
    Abstract: The output speed droop compensating control is associated with a variable displacement pump connected to a motor in a fluid system. The pump has a swash plate urged in one direction by a hydraulic fluid pressure moment acting through the pistons of the pump and a servo control cylinder having a control piston connected to the swash plate. The control includes a control valve connected to the control cylinder and having a set position for maintaining a fluid pressure in the control cylinder to set the position of the swash plate for a particular pump displacement. The control valve is movable from the set position to adjust the position of the swash plate by connection of the control cylinder to either control pressure or drain.
    Type: Grant
    Filed: August 23, 1982
    Date of Patent: November 20, 1984
    Assignee: Sundstrand Corporation
    Inventor: H. Allen Myers
  • Patent number: 4399653
    Abstract: A hydrostatic drive with an automatic adjusting deceleration control device and method for accomplishing the same. The drive includes a prime mover, a variable displacement hydraulic pump, a hydraulic actuator for driving a load through an operating cycle of acceleration, travel, deceleration, and travel, and a control system for regulating drive operation. Sensing devices are used to sense absolute load position at the point the pump reaches minimum displacement following deceleration. This sensed value is then compared by the control system with the theoretical load position within the operating cycle at the point deceleration should be complete, and corrections are made for variations therefrom by advancing or retarding the point at which deceleration is initiated in the operating cycle.
    Type: Grant
    Filed: March 14, 1980
    Date of Patent: August 23, 1983
    Inventor: John A. Pylat, Jr.
  • Patent number: 4194361
    Abstract: To permit mechanical override of an electrical command system to control deflection of the swash plate or eccentricity of an axial or radial piston pump, for example upon failure of the electrical control system, a group of valves 5-8 are connected to an electrical control unit 23 and an additional control valve 4, 4' with a manual control lever 18', 30' is provided, the deflection of the swash plate 1 or eccenter ring 28 of the pump being sensed by a position transducer 22 moved by a linkage which includes the manual control lever. In normal operation, the manual control lever is maintained by spring pressure to deactivate the control valve but, under emergency conditions, the manual control lever will operate the first control valve 4, 4' to admit hydraulic control fluid to position the swash plate, or eccenter ring, respectively, the consequent movement of which is fed back through the linkage to the manual control lever.
    Type: Grant
    Filed: May 19, 1978
    Date of Patent: March 25, 1980
    Assignee: Robert Bosch GmbH
    Inventors: Arnold Pahl, Hans-Jurgen van der Kolk, Manfred Lixenfeld
  • Patent number: 4007592
    Abstract: A speed controller for a rotary pump and motor hydraulic power transmission comprises a pair of pulse generators, one driven at a reference speed and the other proportionally to motor speed. An algebraic summing circuit connects the two pulse generators to the displacement regulator of the hydraulic pump. Error signals produced by the changes in phase of the pulse generators adjust the pump displacement to maintain the motor speed in step with the reference speed.
    Type: Grant
    Filed: November 13, 1975
    Date of Patent: February 15, 1977
    Assignee: Sperry Rand Corporation
    Inventor: Walter J. Zoya
  • Patent number: 3995831
    Abstract: A cable winch control having means for sensing the magnitude of the load in elation to the torque being delivered by the power means to the winding drum. The sensed signal is fed back to a manual controller for the drum winding means, to alert the operator to dangerous load situations that could damage the equipment or break the cable. The feedback signal exerts a restraining force on the controller opposing movement thereof, from a neutral "low-load" position to either the "wind-in" or "wind-out" condition. Therefore, the feedback signal has a fail-safe characteristic that prevents runaway movement of the controller in either direction.
    Type: Grant
    Filed: December 17, 1974
    Date of Patent: December 7, 1976
    Assignee: The United States of America as represented by the Secretary of the Army
    Inventors: Paul L. Spanski, Ronald R. Beck
  • Patent number: 3959967
    Abstract: A system is provided for maintaining a permanent reciprocatory movement of a mechanical arrangement, particularly a pump unit. A main driving wheel is coupled to the mechanical arrangement and fastened on the shaft of a hydraulic motor which is supplied by a variable delivery pump provided with control means. The control means is coupled to the wheel by a drive mechanism which comprises a rocking lever coupled to the control means and a cam carrier wheel rotationally fixed to the wheel. As the mechanical arrangement moves in one direction, the rotation of the driving wheel causes the cam wheel to change the position of the rocking lever thus permitting the control means to direct the flow of fluid from the variable delivery pump to the hydraulic motor to reverse the direction of travel of the mechanical arrangement.
    Type: Grant
    Filed: June 6, 1975
    Date of Patent: June 1, 1976
    Assignee: Centre d'Etudes et de Realisations Industrielles de l'Atlantique C.E.R.I.A.
    Inventors: Joel Chardonneau, Claude Sable
  • Patent number: H1144
    Abstract: A solid propellant rocket motor comprising a motor case, solid propellant and at least one end closure, wherein at least one end closure is connected to the casing by at least one fusible connector which melts at temperatures below those that will cause autoignition of the motor but does not melt during normal propulsion, so that the end closure releases before the antoignition and is retained in place during normal propulsion.
    Type: Grant
    Filed: October 4, 1990
    Date of Patent: March 2, 1993
    Assignee: Hercules Incorporated
    Inventors: Charles C. Cherry, Raymond E. Wiechering