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| Number | Title | Issue Date |
| 6789558 | Digitally controlled direct drive valve and system and method for manufacturing the same An electrical command signal to a direct drive valve is compensated by a digital signal processor to cause the output hydraulic fluid flow from the valve to conform to a desired predetermined flow. The compensation is accomplished by measuring flow from the valve us... | 09/14/2004 |
| 6497035 | Hall position sensor An improved Hall position sensor comprises a Hall effect sensing device having its leads soldered directly to an exposed electro-conductive portion of a flexible multiconductor circuit. The Hall position sensor further comprises a Hall magnet disposed pro... | 12/24/2002 |
| 6439512 | All-hydraulic powered horizontal stabilizer trim control surface position control system A control system utilizes hydraulic power only to control a fixed-wing aircraft horizontal stabilizer trim control surface with no electrical control devices except for a cockpit pilot/co-pilot initiated 3-position spring-centered toggle trim switch, a ba... | 08/27/2002 |
| 6397590 | Hydraulic warming system for use in low ambient temperature applications A hydraulic warming system for low ambient temperature (0° to -65° F.) operation includes a hydraulic motor integrated in a valve manifold and driven by a two-stage jet pipe flow control electro-hydraulic servovalve mounted on the valve manifold in prox... | 06/04/2002 |
| 6352217 | Missile fin locking and unlocking mechanism including a mechanical force amplifier A locking and unlocking mechanism for moveable control fins extending from the surface of a missile. The locking mechanism includes a pin extending thru the outer surface of the missile into an opening provided in the movable fin. A link is pivotally conn... | 03/05/2002 |
| 6344702 | Simplified torque motor A simplified torque motor which includes a plurality of parts defining appropriate alignment slots and grooves as well as openings for properly positioning the parts with respect to each other so that after being secured by appropriate fasteners, the torq... | 02/05/2002 |
| 6343676 | Shock absorber mounted real time damper valve A shock absorber mounted electromagnetically operated real time damper valve which is mounted upon a piston rod and provides a flow path for fluid which bypasses the piston which separates a cylinder of the shock absorber into a pair of fluid containing c... | 02/05/2002 |
| 6334604 | Direct drive valve ball drive mechanism and method of manufacturing the same A direct drive servo-valve wherein rotational motion of a drive motor rotor is converted into linear motion of a spool valve. The drive motor includes a shaft which has affixed to the end thereof a ball which engages the spool valve. The ball is affixed t... | 01/01/2002 |
| 6300739 | Low cost limited angle torque DC brushless servomotor and method for fabricating thereof A novel low cost limited angle torque DC brushless servomotor is disclosed. The motor itself is a modified standard low cost DC brush motor which is modified by removing the brush assembly and substituting in its place an appropriately configured multicon... | 10/09/2001 |
| 6273224 | Shock absorber mounted electromagnetically operated damper valve A shock absorber mounted electromagnetically operated damper valve which is mounted upon a piston rod and provides a flow path for fluid which bypasses the piston which separates a cylinder of the shock absorber into a pair of fluid containing chambers. T... | 08/14/2001 |
| 6250584 | Missile fin locking mechanism A locking mechanism for moveable control fins extending from the surface of a missile. The locking mechanism includes a pin extending thru the outer surface of the missile into an opening provided in the movable fin. A link is pivotally connected between ... | 06/26/2001 |
| 6152271 | Shock absorber mounted electromagnetically operated damper valve A shock absorber mounted electromagnetically operated damper valve which is mounted upon a piston rod and provides a flow path for fluid which bypasses the piston which separates a cylinder of the shock absorber into a pair of fluid containing chambers. T... | 11/28/2000 |
| 5717331 | Demodulator circuit for use with a displacement sensor to provide position information To allow a displacement sensor to operate independently of changes in the excitation signal to the transducer, a demodulating circuit utilizing a single integrator is provided wherein comparison is made between the excitation signal and a reference signal... | 02/10/1998 |
| 5568022 | Integrated compliance servovalve An integrated compliance electrohydraulic servovalve system connected to a load such as a simulated living being to provide more realistic movement thereto. The system includes a pressure transducer for sensing the pressure appearing at the output of the ... | 10/22/1996 |
| 5551481 | Method of manufacturing direct drive servovalve and direct drive servovalve resulting therefrom A method of manufacturing a direct drive servovalve including the steps of providing a completely packaged drive motor and a hydraulic stage positioning the drive motor upon the hydraulic stage and in engagement with a valve contained within the hydraulic... | 09/03/1996 |
| 5551482 | Plastic servovalve Disclosed is a direct drive servovalve having a molded plastic housing. A metal sleeve having a spool valve slidably disposed therein is placed within opposed cavities formed within opposite housing halves. The housing halves are brought together under pr... | 09/03/1996 |
| 5535773 | Hydromechanical differentiating apparatus A hydromechanical differentiating system for actuator dynamic stiffness enhancement and dynamic load damping. A free floating spool valve receives a pressure signal and moves in opposite directions away from a null position. When the valve moves in respon... | 07/16/1996 |
| 5508575 | Direct drive servovalve having magnetically loaded bearing A direct drive servovalve wherein a limited angle force motor is interconnected with a spool valve to convert rotary motion of the drive motor rotor to linear motion of the spool for the control of fluid from a source thereof to a load. The permanent magn... | 04/16/1996 |
| 5504409 | Direct drive servovalve having two landed spool power stage A direct drive servovalve which includes a limited angle force motor having an eccentric engaging a two landed spool for converting rotary motion of the motor rotor into linear motion of the spool so as to control the flow of fluid from a source under pre... | 04/02/1996 |
| 5500580 | Integrated compliance servovalve An integrated compliance electrohydraulic servovalve system connected to a load such as a simulated living being to provide more realistic movement thereto. The system includes a pressure transducer for sensing the pressure appearing at the output of the ... | 03/19/1996 |
| 5497975 | Solenoid pneumatic valve A solenoid valve for use in controlling the flow of pneumatic fluid under pressure between a pair of flow ports defined by a housing. The flow of fluid is controlled by a spool disposed within a bore and is movable between first and second positions. When... | 03/12/1996 |
| 5415079 | Composite cylinder for use in aircraft hydraulic actuator A composite cylinder constructed from a cylindrical liner having an outer surface which is dome shaped adjacent each end. A plurality of layers of resin impregnated carbon filaments are wound on the outer surface of the liner and over the dome shaped port... | 05/16/1995 |
| 5337262 | Apparatus for and method of testing hydraulic/pneumatic apparatus using computer controlled test equipment Automatic test equipment for testing hydraulic/pneumatic devices which devices are included within the test system as well as those which may be attached to the test system. Object oriented programming preferably using C++ language is utilized. Abstract c... | 08/09/1994 |
| 5330225 | Passive vehicle suspension system A low band width passive vehicle suspension system for utilization with land vehicles which includes a shock absorber of the cylinder-piston type suspended between each wheel of the vehicle and its chassis. The piston divides the cylinder into a pair of c... | 07/19/1994 |
| 5318477 | Motor-to-spool coupling for rotary-to-rotary direct drive valve A coupling between a direct drive valve and a rotary valve for providing a rotary-to-rotary coupling therebetween. A shaft carried by the rotor of the motor defines a re-entrant bore having a plurality of flat surfaces. A rod having a plurality of flat fa... | 06/07/1994 |
| 5303727 | Fluidic deflector jet servovalve A deflector jet servovalve including a fluidic amplifier constructed utilizing a plurality of laminae stacked one upon the other and bonded together to form an integral laminated structure. The fluidic amplifier includes a fixed ejector and a pair of rece... | 04/19/1994 |
| 5285812 | Jet level sensor for fuel tanks A jet level sensor used for controlling the liquid level in a tank such as a fuel tank. The sensor includes a nozzle and receiver supported within a bracket so that the nozzle and receiver and the associated conduits are freely rotatable with respect to t... | 02/15/1994 |
| 5285715 | Electrohydraulic servovalve with flow gain compensation An electrohydraulic servovalve including a tailoring circuit coupled to provide a predetermined input signal to the motor of the valve. The predetermined signal functions to control the flow of fluid from the valve to effect a desired result. The electroh... | 02/15/1994 |
| 5263681 | Motor-to-spool coupling for rotary-to-linear direct drive valve A coupling between the motor of a direct drive valve and a spool for converting rotary-to-linear motion. The coupling includes a split bushing with spring means encircling the same and urging it together. The end of a shaft carried by the rotor of the mot... | 11/23/1993 |
| 5263680 | Motor-to-spool coupling for rotary-to-linear direct drive valve A coupling between a direct drive valve motor and a spool for converting rotary-to-linear motion. A bushing is coupled to the spool and defines an opening therein. An end of a shaft carried by the rotor of the motor is received within an opening in the bu... | 11/23/1993 |
| 5156189 | High flow control valve A control valve including a second stage spool for controlling flow of fluid from a source thereof to a load. The valve includes one additional pressure slot and one additional return slot on each side thereof and separated by a land on the spool from the... | 10/20/1992 |
| 5146126 | Adjustable rotor assembly A rotary direct drive servovalve having a force motor which includes a rotor assembly positioned within an isolation tube which is surrounded by a stator assembly. A permanent magnet is disposed adjacent a closed end of the isolation tube and is rotatable... | 09/08/1992 |
| 5063966 | Direct drive servovalve having bearing filter A direct drive servovalve in which rotational motion of a motor rotor is converted into linear motion of a spool valve to direct fluid to a desired load. The drive motor is supported upon a housing within which the spool valve is disposed. The rotor of th... | 11/12/1991 |
| 5052441 | Direct drive servovalve having bearing-located motor housing A direct drive servovalve wherein rotational motion of a drive motor rotor is converted into linear motion of a spool valve. The drive motor is mounted upon the valve housing through utilization of the outer surface of a bearing which supports the rotor s... | 10/01/1991 |
| 5040568 | Direct drive servovalve having positive radial limit stop Disclosed is a direct drive servovalve which includes a drive motor mounted upon a housing for a reciprocally disposed spool valve wherein the rotor of the drive motor engages the spool valve. The rotational motion of the rotor is converted into linear mo... | 08/20/1991 |
| 5035264 | Adjustable stator retainer assembly A direct drive servovalve having a stator and rotor mounted upon a housing within which a spool valve is reciprocally disposed for engagement with the rotor and movement thereby in response to the application of appropriate electrical signals. The stator ... | 07/30/1991 |
| 5031653 | Differential cylinder pressure gain compensation for single stage servovalve Pressure gain compensation for a single-stage servovalve of the jet pipe type. The pressure gain compensation is provided by a separate reciprocally mounted spool having a feedback wire connected between the spool and the ejector jet. The spool has a diff... | 07/16/1991 |
| 4945779 | Ball screw rotary actuator A linear to rotary ball screw actuator which includes both helical grooves and straight grooves longitudinally spaced apart on the outer surface of the shaft. Matching helical grooves and straight grooves are formed on opposed inner surfaces of first and ... | 08/07/1990 |
| 4855047 | High pressure spin-on filter An improved spin-on, throw-away type fluid filter assembly which is capable of withstanding operational pressures in excess of 1000 psi adapted to by threadably affixed to a filter mounting means. The improved filter assembly includes a housing having a c... | 08/08/1989 |
| 4812235 | Filter element assembly replaceable mesh pack A filter element constructed of stainless steel. The element includes a pair of filter media concentrically disposed to receive parallel flow of the filtrant. The element is adapted for disassembly to remove the filter media. The various component parts o... | 03/14/1989 |
