Speed Governor Controlled Input Signal (458) Patents (Class 91/366)
  • Patent number: 7225719
    Abstract: A distributing valve for a speed governor of a turbine is provided, the distributing valve having a structure to reliably vent air therefrom. The distributing valve is disposed such that the direction of movement of a plunger is horizontal, with air vent valves being provided at the highest portion of each of ports of the distributing valve, to facilitate reliable venting of air out of a pressure oil system. Also provided is a structure of the distributing valve to facilitate machining or assembly of the distributing valve.
    Type: Grant
    Filed: May 23, 2005
    Date of Patent: June 5, 2007
    Assignee: Hitachi, Ltd.
    Inventor: Hideaki Imai
  • Patent number: 5832806
    Abstract: A positioning system uses a position feedback signal to position and damp a platform. The position feedback signal is input to an electronic controller that provides a plurality of control signal that are used to position the platform and dampen the platform motion.
    Type: Grant
    Filed: July 12, 1996
    Date of Patent: November 10, 1998
    Assignee: Technical Manufacturing Corporation
    Inventor: Peter G. Nelson
  • Patent number: 5584224
    Abstract: An hydraulic lift system has an actuator connected to an hydraulic circuit, having a pump, via a supply line. A balanced seated valve is connected between the supply line and a reservoir, the valve being controlled by a solenoid and an electric drive unit. The drive unit supplies a gradually increasing or decreasing voltage to the solenoid to open or close the valve gradually. The valve has a valve member that is displaceable along its length and has a valve head of frusto-conical shape. A passage along the valve member balances fluid pressure across the valve member. The solenoid has an armature with a pole face that can be displaced towards a fixed pole face to unseat the valve member. The pole faces have complementary frusto-conical surfaces and there is a non-magnetic washer between them.
    Type: Grant
    Filed: October 11, 1995
    Date of Patent: December 17, 1996
    Assignee: Smiths Industries Public Limited Company
    Inventors: Anthony R. Davies, Stephen J. Downward, Michael J. Wallace
  • Patent number: 5481959
    Abstract: An automatic air balancer system capable of maintaining various kinds of load at a predetermined position and then moving the load at a desired speed, or applying a desired mechanical force to various kinds of object. The system includes a device for controlling the pressure at one end side of a balance cylinder to a desired level by a first pressure control valve and for controlling the pressure at the other end side of the balance cylinder to a predetermined level by a second pressure control valve, and a device for obtaining a balance pressure signal for the balance cylinder. Another signal is added to or subtracted from the balance pressure signal, and the resulting signal is input to the first pressure control valve.
    Type: Grant
    Filed: November 30, 1994
    Date of Patent: January 9, 1996
    Assignee: SMC Corporation
    Inventors: Masayuki Watanabe, Nobuhiro Fujiwara, Kunihisa Kaneko, Kenji Kanazawa
  • Patent number: 5073091
    Abstract: A rotary hydraulic machine which includes a housing having a shaft mounted for rotation within the housing about a shaft axis. A cylidner block is coupled to the shaft for co-rotation with the shaft within the housing and includes a plurality of cylinders disposed in a circumferential array parallel to and surrounding the shaft axis. A piston is disposed to reciprocate within each of the cylinders and is coupled to a yoke for determining displacement of the pistons within the cylinders. A valve plate is mounted on a valve block and includes kidney-shaped slots for registering with the cylinders as the cylinder block rotates, and thereby connecting the cylinders to pump input and output ports. A microprocessor-based controller is externally mounted on the pump valve block and includes internal memory having various remotely-selectable control programs prestored therein.
    Type: Grant
    Filed: September 25, 1989
    Date of Patent: December 17, 1991
    Assignee: Vickers, Incorporated
    Inventors: Roy T. Burgess, Rajamouli Gunda, Frank Herta, Robert C. Hodges, James A. Kessler, Richard S. Leemhuis, Michael R. McCarty, Robert W. Stephens
  • Patent number: 4790234
    Abstract: A fluidic power-assisted setting device has a setting motor having an output torque; a threaded spindle supported for rotation; a spindle nut threadedly mounted on the spindle for linear displacement; a setting member attached to the spindle nut for linear travel therewith; a gearing for transmitting the output torque of the setting motor to the spindle; a signalling device coupled to the gearing for generating an output signal when the linear force derived from the output torque of the setting motor is insufficient to overcome an external force opposing linear displacement of the setting member; and a fluidic power device including a hydraulic motor connected to the setting member for applying thereto a linear force to overcome the external force; and a hydraulic control valve hydraulically connecting the hydraulic motor with pressurized hydraulic fluid as a function of the output signal of the signalling device for causing the hydraulic motor to generate a force applied to the setting member for overcoming
    Type: Grant
    Filed: November 17, 1986
    Date of Patent: December 13, 1988
    Assignee: Sig Schweizerische Industrie-Gesellschaft
    Inventors: Karel Hampejs, Stefan Gabriel
  • Patent number: 4050434
    Abstract: A hydraulic servo-motor for the control of an internal combustion engine which is equipped with a servo-piston, with a fuel quantity control mechanism and with a control slide valve member arranged coaxially to the servo-piston which itself is in operative connection with a centrifugal governor; a working medium under pressure is supplied by a pump driven directly or indirectly by the internal combustion engine; an auxiliary piston arranged coaxially to the servo-piston and to the control slide valve member is acted upon by the pressure of the working medium and permits in case of an existing pressure of the working medium, a stroke of the control slide valve member in one direction which is limited by the servo-piston and a stroke of the control piston in the other direction which is limited by the auxiliary piston; a spring supported at the servo-piston acts on the auxiliary piston opposite the pressure of the working medium and clamps together the control slide valve member and the servo-piston in case of
    Type: Grant
    Filed: June 2, 1975
    Date of Patent: September 27, 1977
    Assignee: Motoren- und Turbinen-Union Friedrichshafen GmbH
    Inventors: Gerhard Zbikowski, Salahaddin Geafer
  • Patent number: 3976389
    Abstract: A pressure gas engine in which pressurized gas such as air is supplied to a series of arcuately arranged nozzles for exhausting into a series of arcuately arranged impulse buckets thereby causing rotation of a rotor in which the buckets are located, each nozzle having an exit adjacent the buckets and each bucket having a curved surface with an entering boundary edge and a leaving boundary edge for the gas blast leaving the bucket so that the blast sweeps across the curved surface of each bucket. The exit diameter of each nozzle is less than the radius of the curved surface of each bucket to achieve a full sweep of each bucket's curved surface from the entering edge to the leaving edge.
    Type: Grant
    Filed: February 28, 1975
    Date of Patent: August 24, 1976
    Assignee: Hollymatic Corporation
    Inventor: James V. Theis, Jr.